ノグチ　ユタカ   NOGUCHI Yutaka   野口　裕    所属   明治大学  理工学部    職種   専任教授
言語種別	英語
発行・発表の年月	2017/11
形態種別	学術雑誌
査読	査読あり
標題	Negative capacitance in an organic solar cell observed by displacement current measurement
執筆形態	共著(筆頭者以外)
掲載誌名	Journal of Physics: Conference Series
掲載区分	国外
出版社・発行元	IOP Publishing
巻・号・頁	924,pp.012012
著者・共著者	Koji Shimizu, Yuya Tanaka, Yutaka Noguchi, Hisao Ishii
概要	We applied displacement current measurement (DCM) to an organic solar cell (OSC) with a structure of ITO/CuPc/C60/BCP/Al in order to investigate the origin of a negative capacitance (NC). In DCM curve, an anomalous characteristic that the current in backward scan was larger than that in forward scan was observed. We found that this characteristic originates from a gradual increase of an additional current, leading to NC in DCM. The additional current can be explained by the increase of the device temperature owing to a Joule heat and thermal deactivation of the exciton. Moreover, NC value was observed to be enhanced by light irradiation due to an additional temperature increase.