https://scholars.lib.ntu.edu.tw/handle/123456789/485084
標題: | Solution-processable bismuth iodide nanosheets as hole transport layers for organic solar cells | 作者: | Boopathi, K. M. Raman, S. Mohanraman, R. Chou, F. C. Chen, Y. Y. Lee, C. H. Chang, F. C. Chu, C. W. |
關鍵字: | Bismuth iodide nanosheet; Hole transport layer; Low temperature; Organic photovoltaics; Solution-processable | 公開日期: | 2014 | 卷: | 121 | 起(迄)頁: | 35-41 | 來源出版物: | Solar Energy Materials and Solar Cells | 摘要: | In this paper we demonstrate the use of low-temperature-solution- processable bismuth iodide (BiI3) nanosheets as hole transport layers in organic photovoltaics with an active layer comprising poly(3-hexylthiophene) (P3HT) mixed with a fullerene derivative. The performance of the resulting devices was comparable with that of corresponding conventionally used systems incorporating polyethylenedioxythiophene:polystyrenesulfonate (PEDOT:PSS). UV-vis spectroscopy revealed that the transparency of a BiI3 layer in the visible (>620 nm) and near-infrared range is greater than that of a PEDOT:PSS layer. X-ray photoemission spectroscopy of a BiI3 film revealed signals at 158.8, 164, 618.6, and 630 eV - characteristic of Bi 4f 7/2, Bi 4f5/2, I 3d5/2, and I 3d3/2, respectively - that indicated a stoichiometric BiI3 film. Wet milling of BiI3 crystals resulted in the formation of nanosheets, the presence of which we confirmed using scanning electron microscopy. The resultant power conversion efficiency of the device was approximately 3.5%, with an open-circuit voltage of 0.56 V, a short-circuit current density of 10.4 mA cm-2, and a fill factor of 60.1% under AM1.5G irradiation (100 mW cm-2). © 2013 Published by Elsevier B.V. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/485084 | ISSN: | 09270248 | DOI: | 10.1016/j.solmat.2013.10.031 | SDG/關鍵字: | Bismuth iodide; Hole transport layers; Low temperatures; Organic photovoltaics; Solution-processable; Bismuth; Conducting polymers; Hole mobility; Nanosheets; Open circuit voltage; Photoelectron spectroscopy; Scanning electron microscopy; Temperature; Three dimensional; Ultraviolet visible spectroscopy; Bismuth compounds |
顯示於: | 凝態科學研究中心 |
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