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题名: Thermal Annealing Effects of Plasmonic Cu1.8S Nanocrystal Films and Their Photovoltaic Properties
作者: Liu, Lige2;  Zhou, Bin3, 4;  Deng, Luogen2;  Fu, Wenping1;  Zhang, Jiatao1;  Wu, Min5;  Zhang, Wenhua3, 4;  Zou, Bingsuo2;  Zhong, Haizheng1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2014-11-20
DOI: 10.1021/jp506043n
卷: 118, 期:46, 页:26964-26972
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Colloidal Cu2-xS nanocrystals are potential abundant, low-cost, and environment-friendly candidates for photovoltaic and photothermal applications. The fabrication of high-quality nanocrystal films through a solution process is a key step toward the exploration of their applications. In this work, we fabricated high-quality Cu1.8S nanocrystal films, characterized their phase transformation under thermal annealing treatments, and investigated the evolution of the corresponding optical and electrical properties. It was demonstrated that the Cu1.8S nanocrystal films undergo a phase transformation from metastable rhombohedral phase to stable tetragonal phase (Cu2S) after annealing at a temperature higher than 240 degrees C, which is much lower than that of the bulk materials (544 degrees C). Along with the transformation, both optical and conductivity properties exhibit well-defined evolution from nonstoichiometric semiconductor to stoichiometric semiconductor, which can be interpreted through a combined electronic structure analysis and theoretical modeling. The correlations between the crystal structure, composition, optical and electrical properties enable us to gain further insights into the structureproperty relationship in Cu2-xS nanocrystals. More importantly, a highly conductive Cu2-xS nanocrystal film with electrical conductivity up to 6.7 S/cm was obtained, implying the potential to be used as conductive electrodes. We further integrated the annealed Cu2-xS nanocrystal films into a photovoltaic device by adopting a FTO/TiO2/Cu2-xS:CdS/MoO3/Au structure, and a preliminary power conversion efficiency of 0.24% was achieved.
关键词[WOS]: RAY PHOTOELECTRON-SPECTROSCOPY ;  COPPER SULFIDE NANOCRYSTALS ;  SENSITIZED SOLAR-CELLS ;  SYSTEM CU-S ;  SEMICONDUCTOR NANOCRYSTALS ;  X-RAY ;  OPTICAL-PROPERTIES ;  COLLOIDAL SEMICONDUCTOR ;  CUPROUS SULFIDES ;  SHAPE CONTROL
语种: 英语
WOS记录号: WOS:000345474000063
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145527
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Nanophoton & Ultrafine Optoelect, Beijing 100081, Peoples R China
2.Beijing Inst Technol, Sch Phys, Micro Nano Technol Ctr, Beijing 100081, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
4.Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
5.Shanghai Inst Space Power Sources, Shanghai 200245, Peoples R China

Recommended Citation:
Liu, Lige,Zhou, Bin,Deng, Luogen,et al. Thermal Annealing Effects of Plasmonic Cu1.8S Nanocrystal Films and Their Photovoltaic Properties[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2014,118(46):26964-26972.
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