Barium: An Efficient Cathode Layer for Bulk-heterojunction Solar Cells

被引：366

作者：

Gupta, Vinay ^{[1
,2
]}

Kyaw, Aung Ko Ko ^{[1
]}

Wang, Dong Hwan ^{[1
]}

Chand, Suresh ^{[2
]}

Bazan, Guillermo C. ^{[1
]}

Heeger, Alan J. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Inst Polymers & Organ Solids, Santa Barbara, CA 93106 USA

[2] Natl Phys Lab, CSIR, Organ & Hybrid Solar Cell Grp, New Delhi 110012, India

来源：

SCIENTIFIC REPORTS | 2013年 / 3卷

关键词：

POLYMER PHOTOVOLTAIC CELLS; OPEN-CIRCUIT VOLTAGE; HIGH-PERFORMANCE; FILL FACTOR; RECOMBINATION; MORPHOLOGY; GEMINATE; NETWORK;

D O I：

10.1038/srep01965

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：

We report Barium (Ba) cathode layer for bulk-heterojunction solar cells which enhanced the fill factor (FF) of p-DTS(FBTTh2)(2)/PC71BM BHJ solar cell up to 75.1%, one of the highest value reported for an organic solar cell. The external quantum efficiency exceeds 80%. Analysis of recombination mechanisms using the current-voltage (J-V) characteristics at various light intensities in the BHJ solar cell layer reveals that Ba prevents trap assisted Shockley-Read-Hall (SRH) recombination at the interface and with different thicknesses of the Ba, the recombination shifts towards bimolecular from monomolecular. Moreover, Ba increases shunt resistance and decreases the series resistance significantly. This results in an increase in the charge collection probability leading to high FF. This work identifies a new cathode interlayer which outclasses the all the reported interlayers in increasing FF leading to high power conversion efficiency and have significant implications in improving the performance of BHJ solar cells.

引用

页数：6

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