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Polythiophene based bulk heterojunction solar cells: Morphology and its implications

机译：基于聚噻吩的体异质结太阳能电池：形态及其意义

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摘要

The performance of bulk heterojunction organic solar cells based on Poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C61 (PCBM) processed from chlorobenzene solution can be enhanced by a thermal treatment of the device. The morphology of films made from 1/2 wt. ratio blends of P3HT and PCBM reveals an unfavorable amorphous phase in the as-produced cells while after annealing a more favorable crystalline phase is obtained. Through variation of the processing solvent a power conversion efficiency of 3.6% is demonstrated without the necessity of an additional annealing step. It is shown that the as-produced active layer already has a crystalline morphology. We argue that the high boiling point of the solvent plays an important role in this by influencing the evaporation speed during deposition of the active layer. Further proof is delivered that indeed slowing down the evaporation speed can beneficially influence the solar cell performance.
机译：可以提高基于氯苯溶液中的聚（3-己基噻吩）（P3HT）和1-（3-甲氧基羰基）-丙基-1-苯基-（6,6）C61（PCBM）的体异质结有机太阳能电池的性能通过对该设备进行热处理。由1 / 2wt。％制成的膜的形态。 P 3 HT和PCBM的比例混合显示出在所产生的电池中不利的非晶相，而在退火之后获得了更有利的结晶相。通过改变处理溶剂，可证明电源转换效率为3.6％，而无需额外的退火步骤。已经表明，所生产的活性层已经具有晶体形态。我们认为，溶剂的高沸点通过影响活性层沉积过程中的蒸发速度在其中起着重要作用。进一步的证据表明，确实降低蒸发速度会有益地影响太阳能电池的性能。

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