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Tuning nanoscale morphology using mixed solvents and solvent vapor treatment for high performance polymer solar cells

机译:使用混合溶剂和溶剂蒸汽处理调节纳米级形态,以制备高性能聚合物太阳能电池

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摘要

A series of high performance polymer solar cells (PSCs) were fabricated with 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-EFT) as the donor and with [6,6] phenyl-C-71-butyric acid methyl ester (PC71BM) as the acceptor. The PSCs processed with DCB/CB mixed solvents show an open circuit voltage (V-oc) of 0.79 V, a short circuit current density (J(sc)) of 13.63 mA cm(-2) and a fill factor (FF) of 62.9%, resulting in the highest PCE of 6.77% compared with a PCE of 5.99% for CB as a solvent and a PCE of 5.39% for DCB as a solvent. The PCE of PSCs processed with DCB/CB mixed solvents is further increased to 7.58% from 6.77% by chloroform vapor annealing treatment for 60 seconds. The PCE improvement should be attributed to the optimized bi-continuous interpenetrating networks of PBDTTT-EFT: PC71BM for better exciton dissociation and charge carrier collection.
机译:用聚[(4,8-双-(2-乙基己氧基)-苯并[1,2-b:4,5-b'](二噻吩)-2)制备了一系列高性能聚合物太阳能电池(PSC), 6-二基-alt-(4-(2-乙基己基)-噻吩并[3,4-b]噻吩)-2,6-二基](PBDTTT-EFT)为供体,并带有[6,6]苯基-C -71-丁酸甲酯(PC71BM)作为受体,用DCB / CB混合溶剂处理的PSC的开路电压(V-oc)为0.79 V,短路电流密度(J(sc))为13.63 mA cm(-2)和62.9%的填充因子(FF),导致最高的PCE为6.77%,而溶剂CB的PCE为5.99%,DCB的PCE为5.39%。通过氯仿蒸气退火处理60秒,用DCB / CB混合溶剂处理的PSC的PCE从6.77%进一步提高到7.58%,PCE的改善应归功于PBDTTT-EFT的优化的双连续互穿网络:PC71BM更好激子解离和电荷载体的收集。

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