https://scholars.lib.ntu.edu.tw/handle/123456789/432814
標題: | Stoichiometric dependence of TiOx as a cathode modifier on band alignment of polymer solar cells | 作者: | Yeh Y.-C. Li S.-S. Wu C.-C. Shao T.-W. Kuo P.-C. Chen C.-W. CHUN-WEI CHEN |
關鍵字: | Built-in potential; Cathode work-function; Charge recombination; Polymer solar cell; Solution processable | 公開日期: | 2014 | 出版社: | Elsevier | 卷: | 125 | 起(迄)頁: | 233-238 | 來源出版物: | Solar Energy Materials and Solar Cells | 摘要: | In this study, we systematically investigated the stoichiometric dependence of titanium oxide (TiOx, x=1.56-1.93) as a cathode modifier on the device performance of polymer solar cells. Electronic structures of the synthesized TiOx modifier layers were controlled by tuning the compositions of various O/Ti ratios. The effective cathode work-functions and the corresponding device performances of polymer solar cells are systematically changed as a result of inserting the TiOx modification layers. Interfacial modification of the Al cathode with a low O/Ti ratio of TiO x layer yields the best performing photovoltaic device as a result of a largest built-in potential. The correlation of power conversion efficiencies and carrier dynamics of these devices by inserting various TiOx modification layer is further examined by using the Mott-Schottky analysis and the impedance spectroscopy technique. The consistent result shows an enhanced carrier collection efficiency and a reduced charge recombination rate of the device via adequate band alignment between the photoactive layer and the cathode using the TiOx modification layer with an optimized O/Ti ratio. © 2014 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84897387476&doi=10.1016%2fj.solmat.2014.03.017&partnerID=40&md5=9b443580474dfb0cf83070217cc08db6 https://scholars.lib.ntu.edu.tw/handle/123456789/432814 |
ISSN: | 09270248 | DOI: | 10.1016/j.solmat.2014.03.017 | SDG/關鍵字: | Alignment; Electronic structure; Polymers; Solar cells; Titanium oxides; Built-in potential; Charge recombinations; Polymer Solar Cells; Solution processable; TiO; Cathodes |
顯示於: | 材料科學與工程學系 |
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