The performance of heterojunction polymer solar cells (PSCs) based on poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) blends was investigated by changing P3HT:PCBM film fabrication procedures with fast growth and slow growth methods, respectively. The optimal time of slow growth of P3HT : PCBM films was gotten after we systematically changed spin-coating time and preset time before annealing blended films. When P3HT : PCBM film was spin coated at the speed of 800RPM and spin time ranged from 50 to 80 sec, and then put in petri dish for 30 min before annealing blended-films, the power conversion efficiency (PCE) of PSCs reached 3%. Yet PCE of PSCs based on P3HT: PCBM with fast-growth was only 1.8%. The improved PCE is attributable to the reasonable phase-separation between P3HT and PCBM blended film, which boosted carriers transport and hop. The result indicates that half an hour of preset time for P3HT : PCBM films before annealing can efficiently finish the slow-growth of blended films, which can save time and decrease cost to fabricate efficient PSCs.%P3HT:PCBM薄膜的快速和缓慢成膜过程能显著的改变异质结聚合物太阳能电池性能.通过调节旋转时间以及薄膜退火前的间隔时间,研究了P3HT:PCBM混合薄膜缓慢生长所需最佳时间.结果表明,在转速800 r·min-1下旋涂薄膜,经过50～80 s的旋涂,接着放置样品薄膜30 min以上,然后再对薄膜进行退火处理,电池效率可以达到3％以上,而快速成膜的电池效率只有1.8％左右.合理的P3HT和PCBM相分离促进了相应载流子的跳跃和传输,是提高电池效率的根本原因.研究结果为准确掌控缓慢生长的混合薄膜提供了时间窗口.
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