23 research outputs found
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Development of Earth-Abundant Tin(II) Sulfide Thin-Film Solar Cells by Vapor Deposition
To sustain future civilization, the development of alternative clean-energy technologies to replace fossil fuels has become one of the most crucial and challenging problems of the last few decades. The thin film solar cell is one of the major photovoltaic technologies that is promising for renewable energy. The current commercial thin film PV technologies are based on and CdTe. Despite their success in reducing the module cost below $1/Wp, these absorber materials face limitations due to their use of scarce (In and Te) and toxic (Cd) elements. One promising candidate for an alternative absorber material is tin monosulfide (SnS). Composed of cheap, non-toxic and earth-abundant elemental constituents, SnS can potentially provide inexpensive PV modules to reach the global energy demand in TW levels. Because of the high volatility of sulfur and various oxidation states of tin, non- stoichiometric chemical composition, traces of other phases , and elemental impurities (e.g. oxygen) are usually observed in SnS films obtained from various reported deposition techniques. First, we present a process to prepare pure, stoichiometric, single-phase SnS films from atomic layer deposition (ALD). The as-deposited SnS films exhibit several attractive properties, including suitable energy band gaps , a large absorption coefficient , and a proper carrier concentration . Then, heterojunction solar cells were fabricated from p-type SnS and n-type zinc oxysulfide (Zn(O,S)). A record high active-area efficiency of 2.46 % was achieved via conduction band offset engineering by varying the oxygen-to-sulfur ratio in Zn(O,S). Finally, we address two approaches potentially used for improving a device efficiency of the SnS solar cell. First, via doping to create an n-type SnS, a p-n homojunction device could be made. We present the processes and the results of doping SnS films with antimony and chlorine, potential n-type dopants. Second, by post-deposition heat treatment, an improvement in the transport properties of SnS film can be achieved. We discuss the effect of temperature and an annealing ambient , and sulfur) on grain growth and the electrical properties of annealed SnS films.Chemistry and Chemical Biolog
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Atomic Layer Deposition of Tin Monosulfide Thin Films
Thin film solar cells made from earth-abundant, non-toxic materials are needed to replace the current technology that uses and , which contain scarce and toxic elements. One promising candidate absorber material is tin monosulfide (). In this report, pure, stoichiometric, single-phase SnS films were obtained by atomic layer deposition (ALD) using the reaction of and hydrogen sulfide at low temperatures (100 to 200 ). The direct optical band gap of SnS is around 1.3 eV and strong optical absorption is observed throughout the visible and near-infrared spectral regions. The films are p-type semiconductors with carrier concentration on the order of and hole mobility in the plane of the films. The electrical properties are anisotropic, with three times higher mobility in the direction through the film, compared to the in-plane direction.Chemistry and Chemical Biolog
Band alignment of SnS/Zn(O,S) heterojunctions in SnS thin film solar cells
Band alignment is critical to the performance of heterojunction thin film solar cells. In this letter, we report band alignment studies of SnS/Zn(O,S) heterojunctions with various compositions of Zn(O,S). Valence band offsets (VBOs) are measured by femtosecond laser pump/probe ultraviolet photoelectron spectroscopy (fs-UPS) from which conduction band offsets (CBOs) are calculated by combining with band gaps obtained by optical transmission/reflection measurements. The SnS/Zn(O,S) heterojunctions with S/Zn ratios of 0.37 and 0.50 have desirable small positive CBOs, while a ratio of 0.64 produces an undesirable large positive CBO. The results are consistent with the device performance of SnS/Zn(O,S) solar cells.Chemistry and Chemical BiologyOther Research Uni
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Band alignment of SnS/Zn(O,S) heterojunctions in SnS thin film solar cells
Band alignment is critical to the performance of heterojunction thin film solar cells. In this letter, we report band alignment studies of SnS/Zn(O,S) heterojunctions with various compositions of Zn(O,S). Valence band offsets (VBOs) are measured by femtosecond laser pump/probe ultraviolet photoelectron spectroscopy (fs-UPS) from which conduction band offsets (CBOs) are calculated by combining with band gaps obtained by optical transmission/reflection measurements. The SnS/Zn(O,S) heterojunctions with S/Zn ratios of 0.37 and 0.50 have desirable small positive CBOs, while a ratio of 0.64 produces an undesirable large positive CBO. The results are consistent with the device performance of SnS/Zn(O,S) solar cells.Chemistry and Chemical BiologyOther Research Uni
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Films Grown by Atomic Layer Deposition
composite films with various aluminum (Al) to tin (Sn) ratios were deposited using an atomic layer deposition technique. The chemisorption behavior of cyclic amide of tin(II) and trimethylaluminum were analyzed by Rutherford backscattering spectroscopy. Both precursors showed retarded and enhanced chemisorption on and surfaces, respectively. The films show highly anisotropic electrical conductivity, i.e., much higher resistivity in the direction through the film than parallel to the surface of the film. The cause of the anisotropy was investigated by cross-sectional transmission electron microscopy, which showed a nanolaminate structure of crystalline grains separated by thin, amorphous monolayers. When the Al concentration was higher than atom percent, the composite films became amorphous, and the vertical and lateral direction resistivity values converged toward one value. By properly choosing the ratio of and subcycles, controlled adjustment of film electrical resistivity over more than 15 orders of magnitude was successfully demonstrated.Chemistry and Chemical Biolog
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Enhancing the Efficiency of SnS Solar Cells bia Band-Offset Engineering with a Zinc Oxysulfide Buffer Layer
SnS is a promising earth-abundant material for photovoltaic applications. Heterojuction solar cells were made by vapor deposition of p-type tin(II) sulfide, SnS, and n-type zinc oxysulfide, Zn(O,S), using a device structure of soda-lime glass/Mo/SnS/Zn(O,S)/ZnO/ITO. A record efficiency was achieved for SnS-based thin-film solar cells by varying the oxygen-to-sulfur ratio in Zn(O,S). Increasing the sulfur content in Zn(O,S) raises the conduction band offset between Zn(O,S) and SnS to an optimum slightly positive value. A record SnS/Zn(O,S) solar cell with a S/Zn ratio of 0.37 exhibits short circuit current density , open circuit voltage , and fill factor (FF) of , 0.244 V, and 42.97%, respectively, as well as an NREL-certified total-area power-conversion efficiency of 2.04% and an uncertified active-area efficiency of 2.46%.Chemistry and Chemical BiologyOther Research Uni
Co-optimization of SnS absorber and Zn(O,S) buffer materials for improved solar cells
Thin-film solar cells consisting of earth-abundant and non-toxic materials were made from pulsed chemical vapor deposition (pulsed-CVD) of SnS as the p-type absorber layer and atomic layer deposition (ALD) of Zn(O,S) as the n-type buffer layer. The effects of deposition temperature and annealing conditions of the SnS absorber layer were studied for solar cells with a structure of Mo/SnS/Zn(O,S)/ZnO/ITO. Solar cells were further optimized by varying the stoichiometry of Zn(O,S) and the annealing conditions of SnS. Post-deposition annealing in pure hydrogen sulfide improved crystallinity and increased the carrier mobility by one order of magnitude, and a power conversion efficiency up to 2.9% was achieved.United States. Department of Energy (Grant DE-EE0005329