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Improved Light Harvesting and Improved Efficiency by Insertion of an Optical Spacer (ZnO) in Solution-Processed Small-Molecule Solar Cells
被引:560
作者:

Kyaw, Aung Ko Ko
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Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA
ASTAR, Inst Mat Res & Engn, Singapore 11760, Singapore Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA

Wang, Dong Hwan
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Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA

Wynands, David
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Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA

Zhang, Jie
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ASTAR, Inst Mat Res & Engn, Singapore 11760, Singapore Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA

Thuc-Quyen Nguyen
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Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA

Bazan, Guillermo C.
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Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA

Heeger, Alan J.
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Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA
机构:
[1] Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA
[2] ASTAR, Inst Mat Res & Engn, Singapore 11760, Singapore
基金:
美国国家科学基金会;
关键词:
Solution-processed small-molecule solar cell;
optical spacer;
ZnO nanoparticle;
recombination;
PHOTOVOLTAIC DEVICES;
INTENSITY DEPENDENCE;
THIN-FILMS;
PHOTOCURRENT;
RECOMBINATION;
PERFORMANCE;
GENERATION;
PLASMONICS;
VOLTAGE;
OXIDE;
D O I:
10.1021/nl401758g
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
We demonstrate that the power conversion efficiency can be significantly improved in solution-processed small-molecule solar cells by tuning the thickness of the active layer and inserting an optical spacer (ZnO) between the active layer and the Al electrode. The enhancement in light absorption in the cell was measured with UV-vis absorption spectroscopy and by measurements of the photoinduced carriers generation rate. The ZnO layer used to improve the light-harvesting increases the charge collection efficiency, serves as a blocking layer for holes, and reduces the recombination rate. The combined optical and electrical improvements raise the power conversion efficiency of solution-processed small-molecule solar cells to 8.9%, that is, comparable to that of polymer counterparts.
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页码:3796 / 3801
页数:6
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