A quantitative model for charge carrier transport, trapping and recombination in nanocrystal-based solar cells

被引:117
作者
Bozyigit, Deniz [1 ]
Lin, Weyde M. M. [1 ]
Yazdani, Nuri [1 ]
Yarema, Olesya [1 ]
Wood, Vanessa [1 ]
机构
[1] ETH, Dept Informat Technol & Elect Engn, Lab Nanoelect, CH-8092 Zurich, Switzerland
来源
NATURE COMMUNICATIONS | 2015年 / 6卷
基金
瑞士国家科学基金会;
关键词
QUANTUM-DOT SOLIDS; THIN-FILMS; ELECTRONIC-PROPERTIES; MOBILITY; PHOTOCONDUCTIVITY; TRANSITION;
D O I
10.1038/ncomms7180
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Improving devices incorporating solution-processed nanocrystal-based semiconductors requires a better understanding of charge transport in these complex, inorganic-organic materials. Here we perform a systematic study on PbS nanocrystal-based diodes using temperature-dependent current-voltage characterization and thermal admittance spectroscopy to develop a model for charge transport that is applicable to different nanocrystalsolids and device architectures. Our analysis confirms that charge transport occurs in states that derive from the quantum-confined electronic levels of the individual nanocrystals and is governed by diffusion-controlled trap-assisted recombination. The current is limited not by the Schottky effect, but by Fermi-level pinning because of trap states that is independent of the electrode-nanocrystal interface. Our model successfully explains the non-trivial trends in charge transport as a function of nanocrystal size and the origins of the trade-offs facing the optimization of nanocrystal-based solar cells. We use the insights from our charge transport model to formulate design guidelines for engineering higher-performance nanocrystal-based devices.
引用
收藏
页数:10
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