| Summary: | 碩士 === 國立中正大學 === 光機電整合工程所 === 95 === Organic solar cells based on p-n heterojunction with different n-type layer materials have been fabricated by high vacuum evaporator system. In our study, the device configurations of organic solar cells using multilayer structure were ITO/various n-type layer/ZnPc (550 Å)/Ag (1000 Å). Two different n-type layer materials were used: 3,4,9,10-perylene-tetracarboxylic dianhydride (PTCDA) and fullerene (C60). In this configuration, ITO, ZnPc, and Ag were used as cathode, p-type layer, and anode respectively.
The effects of different n-type layer materials on the photovoltaic properties of organic solar cells have been systematically investigated. Evidence showed that the device with PTCDA n-type layer exhibits better optical absorption ability, leading to obtain more effective absorption of photons. PTCDA also possesses a shallow bulk trap level, providing more detrapping electrons from the bulk trap states into the lowest unoccupied molecular orbital states for transporting in PTCDA. We suggest that these are the main contributing factors to the superior photovoltaic performances of this device.
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