Limit of V-oc in polymeric bulk heterojunction solar cells predicted by a double-junction model
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摘要In this paper, we will describe the limit of the open-circuit voltage (V-oc) in polymer bulk heterojunction (BHJ) solar cells using a double-junction model. In addition to the often-discussed donor/acceptor junction, we also consider the role of a Schottky junction formed between the cathode and the donor material. Such Schottky junction exists in many BHJ solar cells as a consequence of the undesirable vertical phase separation. The double-junction model was investigated using the impedance spectroscopy and transient photovoltage measurements. By studying different BHJ systems and comparing the characteristics of devices with and without an interlayer between the cathode and the BHJ layer, we found that the V-oc is determined by the junction with the smaller negative capacitance onset and that the cathode modification can tune the V-oc maximum from the Schottky junction limited regime to the donor/acceptor junction limited regime. (C) 2012 Elsevier B.V. All rights reserved.
著者Wang MD, Zheng SZ, Wan X, Su YR, Ke N, Zhao N, Wong KY, Xu JB
期刊名稱Solar Energy Materials and Solar Cells
出版年份2013
月份1
日期1
卷號108
出版社Elsevier
頁次17 - 21
國際標準期刊號0927-0248
電子國際標準期刊號1879-3398
語言英式英語
關鍵詞BHJ; Cathode modification; Double-junction; Organic solar cells
Web of Science 學科類別Energy & Fuels; ENERGY & FUELS; Materials Science; Materials Science, Multidisciplinary; MATERIALS SCIENCE, MULTIDISCIPLINARY; Physics; Physics, Applied; PHYSICS, APPLIED

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