Gautam Prabhat, Misra Rajneesh, Sharma Ganesh D
Department of Chemistry, Indian Institute of Technology, Indore, MP 452017, India.
Phys Chem Chem Phys. 2016 Mar 14;18(10):7235-41. doi: 10.1039/c6cp00243a. Epub 2016 Feb 18.
Two unsymmetrical donor-acceptor-acceptor-π-acceptor type benzothiadiazoles (BTD3 and BTD4) functionalized with tetracyanobutadiene (TCBD) and dicyanoquinodimethane (DCNQ) modules, showing strong absorption in the visible region are reported. The bulk heterojunction solar cells based on BTD4:PC71BM and BTD3:PC71BM based active layers processed with chloroform (CF), thermal annealing and subsequent solvent vapor annealing, i.e. two step annealing (TSA), exhibited PCEs of up to 6.02% and 5.36%, respectively, which is significantly higher than those of the corresponding devices based on the as-cast blend active layer. This enhancement is related to the improvement in exciton dissociation efficiency and more balanced charge transport in the devices based on the active layer processed with TSA treatment.
报道了两种用四氰基丁二烯（TCBD）和二氰基喹喔啉二甲烷（DCNQ）模块功能化的不对称供体-受体-受体-π-受体型苯并噻二唑（BTD3和BTD4），它们在可见光区域有强烈吸收。基于BTD4:PC71BM和BTD3:PC71BM的本体异质结太阳能电池，其活性层用氯仿（CF）处理、热退火以及随后的溶剂蒸汽退火，即两步退火（TSA），分别表现出高达6.02%和5.36%的光电转换效率（PCE），这显著高于基于铸膜混合活性层的相应器件。这种增强与基于TSA处理的活性层的器件中激子解离效率的提高和更平衡的电荷传输有关。
