Another cause that will be elaborated below is the omnipresence of technology in modern societies. S. M. Sze, Physics of semiconductor devices (2nd edition), Wiley, Amsterdam (1981), Microelectronics Journal, vol. for Sustainability Sharmistha Banerjee Stupa of Sanchi The 'Great Stupa' at Sanchi is the oldest stone structure in India and was originally commissioned by the emperor Ashoka the Great in the 200 BC. V. Fthenakis, Sustainability of photovoltaics: the case for thin-film solar cells, Renewable and Sustainable Energy Reviews, vol. 28512852, 1993. 4, pp. Currently, power conversion efficiency of 6.5% has been achieved by Liu et al. 2022, Sulfide and Selenide Based Materials for Emerging Applications: Sustainable Energy Harvesting and Storage Technology Show abstract Binary metal S484S487, 2010. WebSustainable Design Standards: The LACCD has developed a Sustainable Design Standards which outlines the process for achieving sustainable design and lists all Language is one of the most important distinguishing features of our species. The lowered impacts it produces will eventually be overtaken by growth and any associated economic savings will be channeled into other consumptive ends, creating new or exacerbating old damaging patterns. Sustainability has emerged as a central issue for contemporary societies and for the world community as a whole. 3338, 2004. M. A. 11, no. CD4152:Design for Sustainability PD4153:Reverse Engineering ED4091:Advanced Finite Element Analysis CC4002:Industrial Safety Management Therefore, this structure is favored by a variety of world-leading corporates. S. Leone, $4.5 Billion in loans to support three first solar projects, Renewable Energy World, 2011, http://www.renewableenergyworld.com/rea/news/article/2011/07/4-5-in-loans-to-support-three-first-solar-projects. Apply design considerations for The use of Cu may reduce the long-term stability of solar cells, since Cu would gradually diffuse through grain boundaries reaching the interface of the junction and cause the shunt problem. She provides a capsule history of two competing paradigms in design for sustainable development: green and technocratic. 0000026284 00000 n 13, no. Furthermore, the average lower transmittance than wet treatment reflects its better light absorption property (Figure 7, the curve for dry CdCl2 treatment is obviously below the wet one) [35]. To enhance the This fabrication method can achieve high-density, single-crystal nanopillar array with good geometric control. Design for sustainable behaviour . Fan, and A. Javey, Design constraints and guidelines for CdS/CdTe nanopillar based photovoltaics, Applied Physics Letters, vol. 52, no. Although it does help to provide tunneling contact and improve the cell performance, the roll over phenomenon can still not be avoided. 0000085039 00000 n Language permits us to reflect on what we observe and to tell stories about the world we experience. 0000033680 00000 n 3, no. This pattern is the characteristic of addiction. Further, we fail to stop and seek qualitatively different approaches that might work effectively. In many cases, the problems can be narrowly defined and those institutions responsible for fixing the world are clear. Alternatively, some metals, such as Ni, Al, Mo, and W, can be employed to extend cell lifetime. 0000005750 00000 n He concludes his chapter with a discussion of transition theory and its emphasis on the co-evolution of systems, which is the antithesis of top-down control and command systems of planning. 6, pp. On the other hand, it also promotes the formation of CdF2, which could passivate the grain boundaries and forming good CdS/CdTe junctions [11, 28, 29]. 0000045275 00000 n Doordan contends that there is an alternate approach, one based on a foundational critique of the status quo, that links sustainability to promoting human wellbeing rather than enhancing the efficiency of technical systems. Apply design considerations while designing the formed and machined components. 44, no. 9. 0000000949 00000 n 30793084, 2007. 0000085258 00000 n This is an excellent breakthrough since it is difficult to keep high-quality single-crystal structure when moving into nanometer level, and single crystal is usually required for high-efficiency solar cells to maintain high density of e-h pairs. 4. To become effective and excellent collaborators and innovators, participating in efforts to address and provide fast and efficient solutions II. G. C. Morris and S. K. Das, Some fabrication procedures for electrodeposited CdTe solar cells, International Journal of Solar Energy, vol. H. Lin, W. Xia, H. N. Wu, and C. W. Tang, CdS/CdTe solar cells with MoOx as back contact buffers, Applied Physics Letters, vol. 9, no. 0000002530 00000 n 176199, 2010. When the problems fail to respond to the solutions, we frequently intensify our efforts, producing unintended consequences showing up at other places and later in time. This is an open access article distributed under the, http://www1.eere.energy.gov/solar/pdfs/solar_program_mypp_2008-2012.pdf, http://investor.firstsolar.com/releasedetail.cfm?ReleaseID=593994, http://www.renewableenergyworld.com/rea/news/article/2011/07/4-5-in-loans-to-support-three-first-solar-projects, http://www.votum.cz/pdf/workshop/Neumann%20-%20Calyxo-%20Vynikajici%20vyteznost%20na%20Wp.pdf. It begins with The Roots of Unsustainability by John R. Ehrenfeld in which he unequivocally asserts that sustainability means more than simply fixing the problems of unsustainability that are threatening the wellbeing of the environment and human societies. M. A. Matin, M. Mannir Aliyu, A. H. Quadery, and N. Amin, Prospects of novel front and back contacts for high efficiency cadmium telluride thin film solar cells from numerical analysis, Solar Energy Materials and Solar Cells, vol. In 2009, the global production of photovoltaic cells and modules in 2009 was 12.3GW [1], and it increased to over 20GW one year later [2]. 58, no. In the following sec-tions (1e4) we present the DfS approaches which have emerged in the past de-cades. 10, supplement 1, pp. D. G. Diso, G. E. A. Muftah, V. Patel, and I. M. Dharmadasa, Growth of CdS layers to develop all-electrodeposited CdS/CdTe thin-film solar cells, Journal of the Electrochemical Society, vol. 6, pp. If further reducing the thickness of CdTe layers in bifacial configuration, tandem cells can be built to increase the efficiency by absorbing a broader part of solar spectrum, though intensive researches are still required to make it into practice [45, 46]. 816820, 2011. 0000050403 00000 n Currently, the emerging problems related to fabrication mainly focus on (1) the short circuit of TCO and the CdTe layer caused by the partial grain covering and pinholes in CdS with extremely small thickness and (2) short minority carrier life time due to the defects inside the CdTe layer. Design for sustainability is one of the primary focuses in human advancement nowadays, with the aim of developing products and services that meet the needs of the present without compromising the ability of future generations to meet their own needs. 3, pp. Some actionable sustainable design principles that can be implemented to create better designs are: Dematerialisation in a design process, as defined by the United Nations Environment Program (UNEP), is the reduction of total material and energy throughput of any product and service, and thus the limitation of its environmental impact. Henrik Sorensen/Getty Images. 14, pp. The resulted conversion efficiency >14% is rather high since it is the first successful operation of CdS/CdTe-based solar cell prepared by low-temperature deposition, and more work should be done to optimize the process before actually applying for commercial purpose [33]. N. Romeo, A. Bosio, and V. Canevari, The role of CdS preparation method in the performance of CdTe/CdS thin film solar cells, in Proceedings of the 3rd World Conference on Photovoltaic Energy Conversion, vol. As mentioned before, traditional planning and building methods were often good examples of sustainable design in their time, and represented good uses of local resources matched with local skills. A reverse-biased potential would be formed at the CdTe-metal interface to limit the holes transport and would seriously reduce the cells efficiency. There are currently several challenges for further making CdS/CdTe thin-film solar cells more competitive: (1) short minority carrier lifetime due to the recombination of electron-hole pairs at the defect centers in CdTe layers and at the interface between CdS and CdTe, (2) insufficient transparency of transparent conductive oxide (TCO) and CdS window layers, (3) lack of good ohmic contact between CdTe layers and back contacts, and (4) possibility in doping p-type CdTe films in a stable way. The following frequently quoted aphorism, attributed to Albert Einstein, The world we created today as a result of our thinking thus far has problems which cannot be solved by thinking the way we thought when we created them, is more relevant today than ever. 730733, 2010. 1.3 A timeline: design and the sustainability movement. Introduction. If your style isn't in the list, you can start a free trial to access over 20 additional styles from the Perlego eReader. 0000001718 00000 n 94, no. [40] is shown in Figure 9(a). T. Kietzke, Recent advances in organic solar cells, Advances in OptoElectronics, vol. In addition, any gas of Freon family can be applied for carrying Cl2. Sustainability, used without further qualification, has become a container for our highest aspirations, but, until we name those aspirations, has no practical meaning other than a very general sense of possibility and continuity. 0000004747 00000 n 12, Article ID 123504, 2010. Unsustainability, a general set of concerns that the future will not satisfy our aspirations, is just such a problem. X. Wu, J. C. Keane, R. G. Dhere et al., 16.5%-efficient CdS/CdTe polycrystalline thin-film solar cells, in Proceedings of the 17th European Photovoltaic Solar Energy Conference and Exhibition (PVSEC '01), pp. On the other hand, light absorption is enhanced simultaneously due to quantum confinement effect. Green design and product ecodesign . Flourishing gathers a bundle of qualities that have been at the center of human aspirations from time immemorialthe good life, health, solidarity, autonomy, freedom, dignity, and more. More of the same technology in a world that has become machine-likeno matter how effective the technology may bewill not reverse our present unsustainable course. T. Nakada, Y. Hirabayashi, T. Tokado, D. Ohmori, and T. Mise, Novel device structure for Cu(In,Ga)Se2 thin film solar cells using transparent conducting oxide back and front contacts, Solar Energy, vol. An innovative low-cost trial through vacuum deposition (VD) is investigated to fabricate both CdS and CdTe on low-temperature (55C) substrate [32]. 1.1 Our unsustainability and major threats. S103S108, 2011. 15-16, pp. As the world is suffering from impending death of fossil fuels and serious pollution resulted from the fuels, solar energy is now regarded as one promising solution to the global energy crisis. 1, pp. W. P. Hirshman, Surprise, surprise (cell production 2009: survey), Photon International, pp. 58035806, 2010. 6, pp. 70047007, 2008. To solve this problem, Lees work [35] shows that the dry CdCl2 treatment by physical vapor deposition (PVD) on the sputtered CdTe layer. Copyright 2011 Zhou Fang et al. US2004248340 (A1). 1.2 The concept of sustainability: definitions and models. L. Ren and S. Wang, Progress of organic photovoltaic materials, Recent Patents on Materials Science, vol. The work of the German philosopher Alfred Schutz sought to understand action and its connection to consciousness and knowledge. 49, no. Fortunately, several modifications to conventional methods and new techniques have been explored to improve the problems above these years [2636]. 671677, 2010. Many kinds of solar cells based on Si [3], thin film [4, 5], or even organic materials [6, 7] are gradually developed these years. To Understand the principles of generic development process; product planning; customer need analysis for new product design and development. Karim El-Jisr. 14, 2011. Yet, he believes that there is an answer amidst this morass. In particular, we have intentions (expressions of what we want the future to be) that guide our actions. 247279, 2006. PROGRAMME EDUCATIONAL OBJECTIVES (PEOs): (3) I. Cadmium telluride (CdTe)/Cadmium sulphide (CdS) thin-film solar cell is a potential candidate for the production of energy through photovoltaic (PV) technology, N. Romeo, A. Bosio, R. Tedeschi, A. Romeo, and V. Canevari, Highly efficient and stable CdTe/CdS thin film solar cell, Solar Energy Materials and Solar Cells, vol. The theoretical efficiency of CdTe thin-film solar cells is expected to be 28%30% [10, 11]. 27462750, 2009. Lastly, a section on implementation of design for sustainability in education is added to aid readers that wish to introduce this philosophy to younger students. In most cases, the intention implicit in the use of sustainability or sustainable is to slow down and reverse the deterioration of the conditions of the planet, a process I refer to as reducing unsustainability. (PDF) Design for Sustainability: An Introduction - ResearchGate can purchase separate chapters directly from the table of contents 516, no. The paper is structured as follows. The global financial system was incapable of creating sustainability in terms of those ends that had become associated with the economic system, but sustainability was not a word used to describe the crises and their future consequences. The main limitation on its performance is the poor transparency of Cu/Au layer (currently 50% only). J. Han, C. Fan, C. Spanheimer et al., Electrical properties of the CdTe back contact: a new chemically etching process based on nitric acid/acetic acid mixtures, Applied Surface Science, vol. 511-512, pp. Efficiency as high as 16.5% has been achieved in CdS/CdTe heterojunction structure in laboratory in 2001, and current techniques for CdS/CdTe solar cells gradually step toward commercialization. T. L. Chu and S. S. Chu, High efficiency thin film CdS/CdTe solar cells, International Journal of Solar Energy, vol. More than anything, it represents a particular world view or ideologyone that has not only proved to be too narrowly framed but also incredibly damaging. Part 1: Concepts and context. Samples have been obtained successfully by several common techniques: radio frequency sputtering (R. F. Sputtering) [18], close-spaced sublimation (CSS) [19], and chemical bath deposition (CBD) [20] for CdS preparation, while electrodeposition (ED) [21], screen printing (SP) [22], and CSS [2325] for CdTe thin-film formation. 0000076969 00000 n In this part, two of them, namely nanostructure and tandem cells, are discussed. Conversion efficiency of ~6% has been reported in the initial design. In addition, the production line could be simplified as the same process for both CdS/CdTe layers which could further reduce the cost without environment pollution [34]. One excellent improvement to the fabrication of CdS layers is employing R. F. sputtering in the atmosphere of argon (Ar) containing ~3% of CHF3 [11, 2629]. WebDesigning for a Sustainable Future Daniela Busse SAP Labs, LLC (Palo Alto) 3410 Hillview Ave. Palo Alto, California 94304 daniela.busse@sap.com 3, pp. WebDesign for Sustainability: Green Materials and Processes provides fundamental and practical knowledge surrounding product development applications throughout the entire lifecycle of green materials, ranging from conceptual design, material and manufacturing process selection, and environmental lifecycle assessment. Conventionally, an etching with nitric-phosphoric (NP) acid is applied to obtain Te-rich layers on the top of CdTe before copper deposition [11], so that a diffusion layer of CuxTe alloy can be formed during the annealing after Cu deposition. A. N. Tiwari, G. Khrypunov, F. Kurdzesau, D. L. Btzner, A. Romeo, and H. Zogg, CdTe solar cell in a novel configuration, Progress in Photovoltaics: Research and Applications, vol. Hence, Davison, Ehrenfeld and Mathews share the view that design offers an important, positive and practical way forward for realizing sustainability. A. Podest, N. Armani, N. Romeo, A. Bosio, G. Salviati, and M. Prato, Influence of the fluorine doping on the optical properties of CdS thin films for photovoltaic applications, Thin Solid Films, vol. When that concern gathers enough weight to enter the public dialogue, it becomes labeled and is sent to institutions that were created to solve the problems blocking the aspirations and return the world to a state where they can be realized. Figures are taken from [. In Developing Theories for Sustainable Design, Dennis Doordan offers options for a possible next step. Chapter summary. WebSustainability management refers to approaches dealing with social, environmental, and eco-nomic issues in an integrated manner to transform organizations in a way that they Hb```f``ad`e``bd@ AqmQV+F6l,[$hVN}BS.ps. 515, no. S. Marsillac, V. Y. Parikh, and A. D. Compaan, Ultra-thin bifacial CdTe solar cell, Solar Energy Materials and Solar Cells, vol. Instead of summarizing the history, this paper aims to review the progress of CdS/CdTe photovoltaics by evaluating some current techniques to deal with first three challenges above from three aspects: fabrication technology, structural design, and choice of back contact, respectively. Instead, a new etching technique employing nitric-acetic (NA) acid can be applied to avoid roll over phenomenon in J-V curve (Figure 10) and generate better ohmic contact with lower series resistance (4.3cm2) than that of NP acid etching method (6.5cm2) as well as higher fill factor [47]. 256, no. 431-432, pp. This paper has summarized the latest research and techniques to solve the efficiency problem in CdS/CdTe solar cells from aspects of fabrication, structure, and back contact materials. 207, no. J. Lee, Effects of heat treatment of vacuum evaporated CdCl2 layer on the properties of CdS/CdTe solar cells, Current Applied Physics, vol. 12021208, 2007. Design for Sustainability: Green Materials and Processes provides fundamental and practical knowledge surrounding product development applications throughout the entire lifecycle of green materials, ranging from conceptual design, material and manufacturing process selection, and environmental lifecycle assessment. Web8 Sustainable Design December 1998 Introduction to Sustainable Design Principles of Sustainable Design To educate architects to meet this goal of coexistence, we have developed a conceptual framework. Recent advances in OptoElectronics, vol Harvesting and Storage technology Show abstract Binary metal S484S487,.... Simultaneously due to quantum confinement effect amidst this morass which have emerged in the initial design generic development process product! 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