Performance improvement of flexible bulk heterojunction solar cells using PTB7:PC71BM by optimizing spin coating and drying processes
Performance improvement of flexible bulk heterojunction solar cells using PTB7:PC71BM by optimizing spin coating and drying processes
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DOI：
10.7567/jjap.53.02be04
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发表时间：
2014-01
影响因子：
1.5
通讯作者：
Masaya Ohzeki;Shunjiro Fujii;Yuki Arai;Tatsuki Yanagidate;Y. Yanagi;Takanori Okukawa;Akira Yoshida;H. Kataura;Y. Nishioka
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文献类型：
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作者：
Masaya Ohzeki;Shunjiro Fujii;Yuki Arai;Tatsuki Yanagidate;Y. Yanagi;Takanori Okukawa;Akira Yoshida;H. Kataura;Y. Nishioka
采用聚[4,8-二[（2-乙基己基）氧]苯并[1,2-b:4,5-b ']二噻吩-2,6-二基][3-氟-2-[（2-乙基己基）羰基]噻吩[3,4-b]-噻吩二基](PTB7):[6,6]-苯基- c71 -丁酸甲酯（PC71BM）的二氯苯溶液在柔性氧化铟锡包覆的聚对苯二甲酸乙酯衬底上制备了块状异质结太阳能电池。结果表明，将pptb7和PC71BM混合物的自旋涂覆时间缩短至10 s，并将密闭培养皿中的连续干燥和凝固时间延长至30 min，可以显著提高太阳能电池的性能。得到的短路电流密度为14.5 mA/cm2，开路电压为0.62 V，功率转换效率为3.67%。这些改进是由于在缓慢干燥过程中有利的纳米结构的生长，提高了光载流子收集效率，同时增加了每个器件的性能波动。
Bulk-heterojunction solar cells were fabricated using a dichlorobenzene solution of poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]-thiophenediyl] (PTB7):[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) on a flexible indium–tin-oxide-coated polyethylene terephthalate substrate. It was found that the performance of the solar cells could be markedly improved by minimizing the spin coating time of a blend of PTB7 and PC71BM to 10 s and maximizing the successive drying and solidification time up to 30 min in a confined Petri dish. As a result, a short-circuit current density of 14.5 mA/cm2, an open-circuit voltage of 0.62 V, and a power conversion efficiency of 3.67% were obtained. These improvements are attributed to the growth of favorable nanostructures during the slow drying process that increased the photocarrier collection efficiency while simultaneously increasing the performance fluctuations of each device.