Patil Yuvraj, Misra Rajneesh, Chen F C, Sharma Ganesh D
Department of Chemistry, Indian Institute of Technology, Indore (MP) 452020, India.
Department of Photonics, National Chiao Tung University, Hsinchu, Taiwan 300, Taiwan, Republic of China.
Phys Chem Chem Phys. 2016 Aug 17;18(33):22999-3005. doi: 10.1039/c6cp03767d.
We report two acetylene-bridged small molecules DPP5 and DPP6 with low HOMO-LUMO gaps as donors along with PC71BM as an acceptor for the fabrication of solution-processed bulk heterojunction solar cells. After the optimization, i.e. weight ratio of donor to acceptor and surface treatment of the active layer, we achieved overall power conversion efficiencies up to 4.65% (Jsc = 8.19 mA cm(-2), Voc = 0.98 V and FF = 0.58) and 5.73% (Jsc = 9.58 mA cm(-2), Voc = 0.98 V and FF = 0.61), for DPP5:PC71BM and DPP6:PC71BM respectively, which are superior to those for the devices based on as-cast active layers. The significant change in the power conversion efficiency is attributed to the improvement in nanoscale morphology, balanced charge transport and charge collection efficiency, induced through the surface treatment.
我们报道了两种具有低HOMO-LUMO能隙的乙炔桥连小分子DPP5和DPP6作为给体，以及PC71BM作为受体，用于制备溶液处理的体异质结太阳能电池。经过优化，即给体与受体的重量比以及活性层的表面处理，对于DPP5:PC71BM和DPP6:PC71BM，我们分别实现了高达4.65%（Jsc = 8.19 mA cm(-2)，Voc = 0.98 V，FF = 0.58）和5.73%（Jsc = 9.58 mA cm(-2)，Voc = 0.98 V，FF = 0.61）的总功率转换效率，这优于基于铸态活性层的器件。功率转换效率的显著变化归因于通过表面处理诱导的纳米级形态、平衡电荷传输和电荷收集效率的改善。
