Bridging donor-acceptor energy offset using organic dopants as energy ladders to improve open-circuit voltages in bulk-heterojunction solar cells

被引：13

作者：

Chang, Jan-Kai ^{[1
]}

Kuo, Ya-Ching ^{[1
]}

Chen, Yu-Jen ^{[2
]}

Lo, An-Lun ^{[1
]}

Liu, I-Hsiu ^{[1
]}

Tseng, Wei-Hsuan ^{[1
]}

Wu, Kaung-Hsiung ^{[2
]}

Chen, Mei-Hsin ^{[3
]}

Wu, Chih-I ^{[1
]}

机构：

[1] Natl Taiwan Univ, Grad Inst Photon & Optoelect, Taipei 106, Taiwan

[2] Natl Chiao Tung Univ, Dept Elect, Hsinchu 300, Taiwan

[3] Natl Dong Hwa Univ, Dep Optoelect Engn, Hualien 974, Taiwan

来源：

ORGANIC ELECTRONICS | 2014年 / 15卷 / 12期

关键词：

Organic photovoltaics; Open-circuit voltage; Ternary cascade energy alignment; QUANTUM EFFICIENCY;

D O I：

10.1016/j.orgel.2014.08.052

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A systematic way to improve the open circuit voltage of bulk-heterojunction (BHJ) organic photovoltaics is demonstrated by incorporating energy ladder material to form a ternary blend with cascade energy structures. We propose that doping organic molecules with appropriate energetic alignment to bridge the donor-acceptor energy offset can facilitate exciton dissociation and hence improve open-circuit voltage (V-oc) and power conversion efficiency. The cascade energy alignment structure is measured via ultraviolet photoemission spectroscopy. The Voc and power conversion efficiency of devices using the proposed schemes can be enhanced by 10% and 20%, respectively. The results provide a new path toward higher power conversion efficiency in BHJ systems by engineering the energy structures of the materials in the active layers. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：3458 / 3464

页数：7

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