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J. Sastré-Hernández

Bio: J. Sastré-Hernández is an academic researcher from Instituto Politécnico Nacional. The author has contributed to research in topics: Thin film & Cadmium telluride photovoltaics. The author has an hindex of 14, co-authored 36 publications receiving 488 citations. Previous affiliations of J. Sastré-Hernández include Monterrey Institute of Technology and Higher Education.

Papers
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Journal ArticleDOI
TL;DR: In this paper, three types of CdS films obtained from different chemical bath deposition (CBD) processes were studied, and three CBD processes employed sodium citrate as the complexing agent in partial or full substitution of ammonia.

51 citations

Journal ArticleDOI
TL;DR: In this article, the effects of thiourea concentration on CdS thin films deposited by chemical bath deposition (CBD), submitted to post-thermal treatments of CdCl2, and its effect on the characteristics of cdS/CdTe solar cells were studied.

50 citations

Journal ArticleDOI
TL;DR: In this paper, the degradation effects with time in thin film CdTe/CdS solar cells, where the CdS and cdTe layers are deposited by chemical bath deposition (CBD) and close space vapor transport (CSVT), respectively, are presented.

48 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of the thiourea concentration on the photovoltaic performance of the CdS/CdTe solar cells, by the analysis of the I-V curve, for S/cd ratios in the CBD solution from 3 to 8.

37 citations

Journal ArticleDOI
TL;DR: In this paper, a more complete study concerning the physical properties of Chemical Bath Deposited (CBD) CdS layers studied by photoluminescence, X-ray diffraction and optical spectroscopy are correlated to the I-V characteristics under AM 1.5 sunlight and the spectral response of CDS/CdTe solar cells.

31 citations


Cited by
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Journal ArticleDOI
TL;DR: The developments in stability/degradation of OPVs in the last five years are reviewed, such as inverted device structures of the bulk heterojunction geometry device, which allows for more stable metal electrodes, the choice of more photostable active materials, the introduction of interfacial layers, and roll-to-roll fabrication.
Abstract: Organic photovoltaics (OPVs) evolve in an exponential manner in the two key areas of efficiency and stability. The power conversion efficiency (PCE) has in the last decade been increased by almost a factor of ten approaching 10%. A main concern has been the stability that was previously measured in minutes, but can now, in favorable circumstances, exceed many thousands of hours. This astonishing achievement is the subject of this article, which reviews the developments in stability/degradation of OPVs in the last five years. This progress has been gained by several developments, such as inverted device structures of the bulk heterojunction geometry device, which allows for more stable metal electrodes, the choice of more photostable active materials, the introduction of interfacial layers, and roll-to-roll fabrication, which promises fast and cheap production methods while creating its own challenges in terms of stability.

1,258 citations

Journal ArticleDOI
TL;DR: In this paper, the technical progress made in the past several years in the area of mono- and polycrystalline thin-film photovoltaic (PV) technologies based on Si, III-V, II-VI, and I-III-VI2 semiconductors, as well as nano-PV.

914 citations

Journal ArticleDOI
TL;DR: In this article, a review of the materials aspects of CdTe/CdS solar cells for solar energy conversion is presented, focusing on fundamental and critical aspects like: (a) choice of window layer and absorber layer; (b) drawbacks associated with the device including environmental problems, optical absorption losses and back contact barriers; (c) structural dynamics at CdS-CdTe interface; (d) influence of junction activation process by CdCl2 or HCF2Cl treatment; (e) interface and grain boundary passivation effects; (f
Abstract: Among the armoury of photovoltaic materials, thin film heterojunction photovoltaics continue to be a promising candidate for solar energy conversion delivering a vast scope in terms of device design and fabrication. Their production does not require expensive semiconductor substrates and high temperature device processing, which allows reduced cost per unit area while maintaining reasonable efficiency. In this regard, superstrate CdTe/CdS solar cells are extensively investigated because of their suitable bandgap alignments, cost effective methods of production at large scales and stability against proton/electron irradiation. The conversion efficiencies in the range of 6–20% are achieved by structuring the device by varying the absorber/window layer thickness, junction activation/annealing steps, with more suitable front/back contacts, preparation techniques, doping with foreign ions, etc. This review focuses on fundamental and critical aspects like: (a) choice of CdS window layer and CdTe absorber layer; (b) drawbacks associated with the device including environmental problems, optical absorption losses and back contact barriers; (c) structural dynamics at CdS–CdTe interface; (d) influence of junction activation process by CdCl2 or HCF2Cl treatment; (e) interface and grain boundary passivation effects; (f) device degradation due to impurity diffusion and stress; (g) fabrication with suitable front and back contacts; (h) chemical processes occurring at various interfaces; (i) strategies and modifications developed to improve their efficiency. The complexity involved in understanding the multiple aspects of tuning the solar cell efficiency is reviewed in detail by considering the individual contribution from each component of the device. It is expected that this review article will enrich the materials aspects of CdTe/CdS devices for solar energy conversion and stimulate further innovative research interest on this intriguing topic.

333 citations

Journal ArticleDOI
TL;DR: In this article, a review is presented on the status of synthesizing thin films of metal chalcogenide and metal oxides by CBD and SILAR, and properties and applications of the thin films are also summarized.

307 citations

Journal ArticleDOI
TL;DR: In this article, the influence of the deposition temperature varied from 55°C to 85°C in a step of 5°C on the crystallographic structure, morphology as well as optical and electrical properties was investigated in detail.

193 citations