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The effect of a concentration graded cathode for organic solar cells |
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| Authors: | Ji Hye JeonHang Ken Lee Dong Hwan WangSoon Mi Park Jeong Won KimKyung Joong Kim Jong Hyeok Park O Ok Park |
| Affiliation: | a Department of Chemical and Biomolecular Engineering (BK21 Graduate Program), Korea Advanced Institute of Science and Technology, 291 Deahak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea b Korea Research Institute of Standards and Science (KRISS), Yuseong, Daejeon 305-600, Republic of Korea c Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea |
| Abstract: | We present the effects of a concentration graded Li:Al cathode when it is made by one-step evaporation method using single alloy sources on the performance of organic solar cells. The concentration profile of the Li:Al cathode and related interface energy levels were investigated by means of secondary ion mass spectroscopy and ultraviolet photoelectron spectroscopy, in comparison with those of a common Al cathode. The results indicate that interfacial lithium accumulation introduces a cascade decrease of the work function (WF) of the cathode. The WF graded cathode applied to bulk heterojunction solar cells resulted in increased short circuit current and power conversion efficiency. Furthermore, the Li:Al cathode avoids the formation of interface Al-C complex, which may cause disruption of electron transport. |
| Keywords: | Organic photovoltaic Li:Al alloy Aluminum-carbon complex Concentration graded cathode |
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