《Table 1 Measured photovoltaic characteristics Data using PBDBT:IDTBR based device with different CB

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《苝二酰亚胺:有机膦盐基双组份共混电子传输层及其开路电压接近1.0 V的非富勒烯聚合物太阳电池（英文）》

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aCalculated from EQE spectrum，b The best performing device was prepared under the optimal conditions as provided in the Methods section.

The current density–voltage characteristics（J–V）of organic solar cell fabricated with PBDBT-IDTBR using individual CBL as well as dual mixture was investigated.In presence of PDINO and QPh PBr as CBL the photovoltaic parameters Voc，short-circuit current density Jsc and Fill Factor FF 0.951 V，10.62 m A·cm-2，53.9%and 0.962 V，11.72 m A·cm-2，56.0%were analyzed with power conversion efficiency（PCE）of5.45%and 6.32%，respectively.However after fabrication with dual mixture of CBL PDINO:QPh PBr above active layer，further improvement in device parameters with 0.984 V Voc，13.45 mA·cm-2 Jsc and 62.45%FF was achieved.Thus the final PCE of 8.27%was gained，which showed a total increment in PCE of 30.8%from QPhPBr and 51.7%from PDINO using dual CBL.The step by step improvement in photovoltaic performance moving from PDINO to dual mixture of CBL suggests that dual behavior of CBL facilitates more probability to improves electron extraction，causes hole trapping effect at interface to reduce recombination losses as well as more reliable to achieve suitable energy level work function of cathode for increased electron charge transfer.The light J–V curve displays in Fig.3a and data collected in Table 1.Our idea reveals that improved performance can be obtained in OSCs devices using binary blended CBL.Large improvement in Voc defined by increased energy difference between HOMO of donor and LUMO of acceptor as well as better coordination of CBL with Al cathode after fine tuning of cathode work function.