Abstract Thin films of the ternary polymer blend (donors PCE-10 and PCDTBT with the acceptor PC71BM in chlorobenzene) were fabricated by using spray coating technique without and with applied voltage to the nozzle during deposition. The increased absorption range from 400 nm to 800 nm indicates that Forster resonance energy transfer (FRET) is occurring for the films deposited under the electric field. This is also supported by photoluminescence measurements and suggesting that under the applied voltage the orientation of polymer chains are changing at desired distances to facilitate FRET phenomenon to occur due to repulsion between uniformly charged ultrafine droplets. The size of droplets further reduced at higher applied voltage. Absorption, photoluminescence, femtosecond transient absorption spectra and Kinetics traces were recorded to elucidate the role of applied DC voltages during the deposition of these films on photovoltaic performance of bulk heterojunction organic solar cell. The effect of FRET in polymer-polymer thin film under applied voltage during the deposition is observed, which indicates enhancement in the power conversion efficiency with the maximum value of 6.86% (Jsc of 15.81 mA/cm2 and Voc of 0.77 V) at an applied voltage of 750 V.

中文翻译：

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电场辅助喷涂技术制造的有机光伏器件中的 Förster 共振能量转移

摘要 通过喷涂技术制备了三元聚合物共混物（供体 PCE-10 和 PCDTBT 以及受体 PC71BM 在氯苯中）的薄膜，在沉积过程中，喷嘴不施加电压和施加电压。吸收范围从 400 nm 增加到 800 nm 表明在电场下沉积的薄膜发生了 Forster 共振能量转移 (FRET)。这也得到了光致发光测量的支持，并表明在施加电压下，聚合物链的取向在所需距离处发生变化，以促进由于均匀带电的超细液滴之间的排斥而发生的 FRET 现象。在更高的施加电压下，液滴的尺寸进一步减小。吸收、光致发光、记录了飞秒瞬态吸收光谱和动力学轨迹，以阐明在沉积这些薄膜期间施加的直流电压对体异质结有机太阳能电池的光伏性能的作用。观察到在沉积过程中施加电压下聚合物-聚合物薄膜中 FRET 的影响，这表明功率转换效率提高，最大值为 6.86%（Jsc 为 15.81 mA/cm2，Voc 为 0.77 V）。电压为 750 V。