Efficient small molecular ternary solar cells by synergistically optimized photon harvesting and phase separation

被引:71
作者
An, Qiaoshi [1 ]
Zhang, Fujun [1 ]
Sun, Qianqian [1 ]
Wang, Jian [1 ]
Li, Lingliang [1 ]
Zhang, Jian [2 ]
Tang, Weihua [3 ]
Deng, Zhenbo [1 ]
机构
[1] Beijing Jiaotong Univ, Minist Educ, Key Lab Luminescence & Opt Informat, Beijing 100044, Peoples R China
[2] Guilin Univ Elect Technol, Guangxi Key Lab Informat Mat, Dept Mat Sci & Technol, Guilin 541004, Peoples R China
[3] Nanjing Univ Sci & Technol, Minist Educ, Key Lab Soft Chem & Funct Mat, Nanjing 210094, Jiangsu, Peoples R China
基金
中国国家自然科学基金; 北京市自然科学基金;
关键词
OPEN-CIRCUIT VOLTAGE; ENERGY-TRANSFER; FILL FACTOR; POLYMER; PERFORMANCE; ENHANCEMENT; MORPHOLOGY; RECOMBINATION; IMPROVEMENT; LAYER;
D O I
10.1039/c5ta04243g
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
Recently, power conversion efficiency (PCE) of organic solar cells has been increased up to about 10% by using solvent additives or mixed solutions to elaborately adjust phase separation which is a great challenge for large scale production. We report a champion PCE of 7.40% for solution-processed small molecule ternary SMPV1 : DIB-SQ : PC71BM solar cells by only adjusting the DIB-SQ doping ratio in donors without any treatments on the blend solutions or active layers. The champion PCE of ternary solar cells is larger than the champion PCEs sum (6.98%) of binary solar cells with SMPV1 : PC71BM or DIB-SQ : PC71BM as the active layers. The PCE improvement should be attributed to the synergistic enhancement of photon harvesting, exciton dissociation, charge carrier transport and collection by the appropriate DIB-SQ doping ratio in donors. The experimental results on morphology, crystallinity, phase separation and charge carrier mobility of active layers well support the PCE improvement in ternary solar cells with a 10 wt% DIB-SQ doping ratio in donors.
引用
收藏
页码:16653 / 16662
页数:10
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