Publication in refereed journal
香港中文大学研究人员 ( 现职)
| 赵铌教授 (电子工程学系) |
| 路新慧教授 (物理系) |
| 徐海华博士 (信兴高等工程研究所) |
全文
| 数位物件识别号 (DOI) http://dx.doi.org/10.1038/srep05211 |
引用次数
Web of Sciencehttp://aims.cuhk.edu.hk/converis/portal/Publication/15WOS source URL
其它资讯
摘要The interpenetrating morphology formed by the electron donor and acceptor materials is critical for the performance of polymer: fullerene bulk heterojunction (BHJ) photovoltaic (PV) cells. In this work we carried out a systematic investigation on a high PV efficiency (>6%) BHJ system consisting of a newly developed 5,6-difluorobenzo[c](1,2,5) thiadiazole-based copolymer, PFBT-T20TT, and a fullerene derivative. Grazing incidence X-ray scattering measurements reveal the lower-ordered nature of the BHJ system as well as an intermixing morphology with intercalation of fullerene molecules between the PFBT-T20TT lamella. Steady-state and transient photo-induced absorption spectroscopy reveal ultrafast charge transfer (CT) at the PFBT-T20TT/fullerene interface, indicating that the CT process is no longer limited by exciton diffusion. Furthermore, we extracted the hole mobility based on the space limited current (SCLC) model and found that more efficient hole transport is achieved in the PFBT-T20TT: fullerene BHJ as compared to pure PFBT-T20TT, showing a different trend as compared to the previously reported highly crystalline polymer: fullerene blend with a similar intercalation manner. Our study correlates the fullerene intercalated polymer lamella morphology with device performance and provides a coherent model to interpret the high photovoltaic performance of some of the recently developed weakly-ordered BHJ systems based on conjugated polymers with branched side-chain.
着者Xiao T, Xu HH, Grancini G, Mai JQ, Petrozza A, Jeng US, Wang Y, Xin X, Lu Y, Choon NS, Xiao H, Ong BS, Lu XH, Zhao N
期刊名称Scientific Reports
出版年份2014
月份6
日期9
卷号4
出版社NATURE PUBLISHING GROUP
国际标準期刊号2045-2322
电子国际标準期刊号2045-2322
语言英式英语
Web of Science 学科类别Multidisciplinary Sciences; MULTIDISCIPLINARY SCIENCES; Science & Technology - Other Topics
