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LF拓扑空间中分离性T_i(i=2,3)的几点注记
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作者 孙庆准 孟广武 《聊城大学学报(自然科学版)》 2006年第1期4-5,共2页
王国俊教授在L-拓扑空间论一书中研究LF拓扑空间分离性时,T2强调支撑点不一样,T3则强调非零准分明闭集.本文对T2分离性给出了注记,对T3分离性进行了改进.
关键词 LF拓扑学 Ti(i=2 3)分离性 正则分离性 正则分离性
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Constructing vertical phase separation of polymer blends via mixed solvents to enhance their photovoltaic performance
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作者 Qingqing Yang Jiantai Wang +3 位作者 Xiaoqin Zhang Jun Zhang Yingying Fu Zhiyuan Xie 《Science China Chemistry》 SCIE EI CAS CSCD 2015年第2期309-316,共8页
A polymer blend comprising poly(3-hexylthiophene)(P3HT)donor and poly[2,7-(9,9′-octyl-fluorene)-alt-5,5-(4′,7′-di-2-thienyl-5′,6′-bis(hexyloxy)-2′,1′,3′-benzothiadiazole)](PFDTBT-OC6)acceptor is used as the ac... A polymer blend comprising poly(3-hexylthiophene)(P3HT)donor and poly[2,7-(9,9′-octyl-fluorene)-alt-5,5-(4′,7′-di-2-thienyl-5′,6′-bis(hexyloxy)-2′,1′,3′-benzothiadiazole)](PFDTBT-OC6)acceptor is used as the active layer to fabricate all-polymer solar cells.The blend morphology variance processed with pure and mixed solvents,and the related photovoltaic performance,are investigated in detail.It is found that,due to its low surface energy,a thin P3HT enrichment layer on the top surface of the active layer greatly increases bimolecular recombination and results in S-kinks of the illuminated current density-voltage curves.With the incorporation of p-xylene(a marginal solvent of P3HT)in the blend solution,the P3HT enrichment atop the active layer surface is effectively decreased because the high boiling-point p-xylene suppresses the diffusion of P3HT chains toward the top surface during the film-drying process.The bimolecular recombination was thus improved and the S-kinks of the photovoltaic curves were completely removed.The overall power conversion efficiencies of the devices are strongly boosted(from 0.88%to 1.41%)when chlorobenzene:p-xylene mixed solvent is used to replace pure chlorobenzene. 展开更多
关键词 polymer solar cells polymer blends vertical phase separation bimolecular recombination S-kink
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