Investigation of Charge Carrier Behavior in High Performance Ternary Blend Polymer Solar Cells

被引:90
作者
Lee, Tack Ho [1 ]
Uddin, Mohammad Afsar [2 ,3 ]
Zhong, Chengmei [4 ,5 ]
Ko, Seo-Jin [1 ,4 ]
Walker, Bright [1 ]
Kim, Taehyo [1 ]
Yoon, Yung Jin [1 ]
Park, Song Yi [1 ]
Heeger, Alan J. [4 ]
Woo, Han Young [2 ]
Kim, Jin Young [1 ]
机构
[1] UNIST, Dept Energy Engn, Ulsan 44919, South Korea
[2] Korea Univ, Dept Chem, Seoul 136713, South Korea
[3] Pusan Natl Univ, Dept Cogno Mechatron Engn, Miryang 627706, South Korea
[4] Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA
[5] South China Univ Technol, Sch Chem & Chem Engn, State Key Lab Luminescent Mat & Devices, Guangzhou 510641, Guangdong, Peoples R China
基金
新加坡国家研究基金会;
关键词
ORGANIC PHOTOVOLTAICS; CONJUGATED POLYMER; EFFICIENCY; GENERATION; RESONANCE; ORIGIN;
D O I
10.1002/aenm.201600637
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This study demonstrates high-performance, ternary-blend polymer solar cells by modifying a binary blend bulk heterojunction (PPDT2FBT:PC71BM) with the addition of a ternary component, PPDT2CNBT. PPDT2CNBT is designed to have complementary absorption and deeper frontier energy levels compared to PPDT2FBT, while being based on the same polymeric backbone. A power conversion efficiency of 9.46% is achieved via improvements in both short-circuit current density (J(SC)) and open-circuit voltage (V-OC). Interestingly, the V-OC increases with increasing the PPDT2CNBT content in ternary blends. In-depth studies using ultraviolet photoelectron spectroscopy and transient absorption spectroscopy indicate that the two polymers are not electronically homogeneous and function as discrete light harvesting species. The structural similarity between PPDT2CNBT and PPDT2FBT allows the merits of a ternary system to be fully utilized to enhance both J(SC) and V-OC without detriment to fill-factor via minimized disruption of semi-crystalline morphology of binary PPDT2FBT: PC (71) BM blend. Further, by careful analysis, charge carrier transport in this ternary blend is clearly verified to follow parallel-like behavior.
引用
收藏
页数:9
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