An Qiaoshi, Zhang Fujun, Li Lingliang, Zhuo Zuliang, Zhang Jian, Tang Weihua, Teng Feng
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, 100044, China.
Phys Chem Chem Phys. 2014 Aug 14;16(30):16103-9. doi: 10.1039/c4cp01411a.
We present a route to successfully tackle the two main limitations, low open circuit voltage (Voc) and limited short circuit-density (Jsc), of polymer solar cells (PSCs) based on poly(3-hexylthiophene) (P3HT) as an electron-donor. The indene-C60 bisadduct (ICBA) was selected as an electron acceptor to improve the open circuit voltage (Voc). The narrow band gap polymer poly[(4,8-bis-(2-ethylhexyloxy)-benzo[1,2-b:4,5-b']dithiophene)-2,6-diyl-alt-(4-(2-ethylhexanoyl)-thieno[3,4-b]thiophene)-2,6-diyl] (PBDTTT-C), as a complementary electron-donor material, was doped into the host system of P3HT:ICBA to form ternary cascade energy structured PSCs with increased Jsc. The power conversion efficiency (PCE) of P3HT:ICBA-based cells was improved from 3.32% to 4.38% by doping with 3 wt% PBDTTT-C with 1 min 150 °C annealing treatment. The 4.38% PCE of ternary PSCs is still larger than the 3.79% PCE of PSCs based on P3HT:ICBA with 10 minutes 150 °C annealing treatment.
我们提出了一种成功解决基于聚（3 - 己基噻吩）（P3HT）作为电子给体的聚合物太阳能电池（PSC）两个主要限制因素的方法，这两个因素分别是低开路电压（Voc）和有限的短路电流密度（Jsc）。选择茚 - C60双加合物（ICBA）作为电子受体以提高开路电压（Voc）。将窄带隙聚合物聚[（4,8 - 双 -（2 - 乙基己氧基） - 苯并[1,2 - b：4,5 - b']二噻吩） - 2,6 - 二基 - 交替 -（4 -（2 - 乙基己酰基） - 噻吩并[3,4 - b]噻吩） - 2,6 - 二基]（PBDTTT - C）作为互补电子给体材料，掺杂到P3HT：ICBA的主体体系中，形成具有更高Jsc的三元级联能量结构的PSC。通过在150℃下退火处理1分钟，掺杂3 wt％的PBDTTT - C，基于P3HT：ICBA的电池的功率转换效率（PCE）从3.32％提高到4.38％。三元PSC的4.38％的PCE仍然高于在150℃下退火处理10分钟的基于P3HT：ICBA的PSC的3.79％的PCE。
