Enhanced performance of pseudo-bilayer organic photovoltaic devices via small molecule doping

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题名:	Enhanced performance of pseudo-bilayer organic photovoltaic devices via small molecule doping
作者:	陳銘洲;Syu, Yu-Wei;Huang, Peng-Yi;Li, Husan-De;Hsu, Ching-Ling;Chiu, Kuan-Cheng;Kim, Choongik;Chen, Ming-Chou;Chao, Yu-Chiang
贡献者:	理學院化學學系
日期:	2014-05-15
上传时间:	2026-04-21 14:26:16 (UTC+8)
出版者:	American Chemical Society
摘要:	摘要： Controlling both the film crystallinity of the active layer for better charge transport and the interdiffusion between donor and acceptor materials for optimal bicontinuous networks is essential in producing pseudo-bilayer polymer solar cells. In this work, we investigated the influence of a doping solution-processable small molecule with high carrier mobility, 5,11-bis(triethylsilylethynyl) anthradithiophene (TES-ADT), on the performance of pseudo-bilayer polymer solar cells made of an underlayer of poly(3-hexylthiophene) (P3HT) and an upper layer of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). By analysis of the X-ray diffraction and UV–vis absorbance spectra of P3HT:TES-ADT blend films it was demonstrated that the film crystallinity was enhanced by TES-ADT doping in the P3HT underlayer. The hole mobility extracted from the current density–voltage curves of hole-only devices based on P3HT:TES-ADT demonstrated an optimized value with proper TES-ADT doping and thermal annealing. An intermixed photoactive layer was observed for the annealed device, indicating the occurrence of interdiffusion with a large interfacial area. With improved film crystallinity and interdiffusion, the optimal device performance was obtained when 5% TES-ADT was blended with P3HT and a thermal annealing treatment at 150 °C for 1 min was conducted. At that optimal condition, the mean crystallite size was increased by 35%, and hence the enhancement of 8% and 14% in power conversion efficiency and short-circuit current density was observed, respectively. 其他題名： J. Phys. Chem. C 出版者： American Chemical Society 出版日期： 2014-05-15 出處： Journal of physical chemistry. C, 2014-05, Vol.118 (19), p.9958-9965 資源來源： American Chemical Society Journals 版權： Copyright © 2014 American Chemical Society 識別號： ISSN: 1932-7447 識別號： EISSN: 1932-7455 識別號： DOI: 10.1021/jp502331x
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