Air Stable, Photosensitive, Phase Pure Iron Pyrite Nanocrystal Thin Films for Photovoltaic Application

Iron pyrite (FeS2) is a naturally abundant and nontoxic photovoltaic material that can potentially make devices as efficient as silicon-based ones; however existing iron pyrite photovoltaic devices contain thermodynamically unstable FeS2 film surfaces that lead to low open circuit voltages. We repor...

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Veröffentlicht in:	Nano letters Jg. 11; H. 11; S. 4953 - 4957
Hauptverfasser:	Bi, Yu, Yuan, Yongbo, Exstrom, Christopher L, Darveau, Scott A, Huang, Jinsong
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Washington, DC American Chemical Society 09.11.2011
Schlagworte:	Air Applied sciences Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science; rheology Crystallization - methods Decomposition Devices Electric Conductivity Electronics Exact sciences and technology Iron Iron - chemistry Iron - radiation effects Light Materials Materials science Materials Testing Membranes, Artificial Molecular electronics, nanoelectronics Nanocrystalline materials Nanocrystals Nanoscale materials and structures: fabrication and characterization Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals Nanostructure Nanostructures - chemistry Nanostructures - radiation effects Open circuit voltage Photovoltaic cells Physics Pyrite Radiation Dosage Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Solar cells Structure of solids and liquids; crystallography Sulfides - chemistry Sulfides - radiation effects Thin films photoconductive iron pyrite Nanocrystals photovoltaic Cubic lattices Iron Iron sulfide Photovoltaic cell Thin films Pyrite Silicon Carrier mobility Photoconductivity Sulfur Nanostructured materials TOPO Nanocrystal
ISSN:	1530-6984, 1530-6992, 1530-6992
Online-Zugang:	Volltext
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Zusammenfassung:	Iron pyrite (FeS2) is a naturally abundant and nontoxic photovoltaic material that can potentially make devices as efficient as silicon-based ones; however existing iron pyrite photovoltaic devices contain thermodynamically unstable FeS2 film surfaces that lead to low open circuit voltages. We report the rational synthesis of phase pure, highly crystalline cubic FeS2 nanocrystals (NCs) using a trioctylphosphine oxide (TOPO) assisted hot-injection method. The synthesized pyrite NC films have excellent air stability over one year. In contrast, obvious surface decomposition was observed on the surface of FeS2 NCs synthesized without TOPO. A high carrier mobility of 80 cm2/(V s) and a strong photoconductivity were observed for the first time for pyrite films at room temperature. Our results indicate that TOPO passivates both iron and sulfur atoms on FeS2 NC surfaces, efficiently inhibiting surface decomposition.
Bibliographie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1530-6984 1530-6992 1530-6992
DOI:	10.1021/nl202902z