Layer effects of photovoltaic heterojunction of fully conjugated heterocyclic aromatic rigid‐rod polymer poly‐p‐phenylenebenzobisoxazole |
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| Authors: | Jen‐Wei Huang Shih Jung Bai |
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| Institution: | 1. Institute of Materials Science and Engineering, National Sun Yat‐sen University, Kaohsiung, Taiwan, Republic of China;2. Institute of Materials Science and Engineering, National Sun Yat‐sen University, Kaohsiung, Taiwan, Republic of ChinaInstitute of Materials Science and Engineering, National Sun Yat‐sen University, Kaohsiung, Taiwan, Republic of China |
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| Abstract: | Poly‐p‐phenylenebenzobisoxazole (PBO) contains a fully conjugated rod‐like backbone entailing excellent optoelectronic properties and superior stabilities. Poly(2,3‐dihydrothieno‐1,4‐dioxin):polystyrenesulfonate (PEDOT:PSS) is a hole transferring medium, which was spun into a thin‐film between PBO and indium‐tin‐oxide to facilitate photovoltaic (PV) effect by forming a donor‐acceptor interlayer to separate and to transport photoinduced charges. Optimum PBO thickness for PV heterojunctions was about 71 nm at which the hole transferring PEDOT:PSS generated the maximum short circuit current (Isc) at a thickness of 115 nm. By using a layer of lithium fluoride (LiF) as an electron transferring layer adhering to Al cathode, the most open circuit voltage (Voc) and Isc were achieved with a LiF thickness of 1–2 nm because of possible electric dipole effect leading to an increase of Voc from 0.7 to 0.92 V and of Isc from about 0.1 to 0.2 μA. No PV response was observed for all PBO homojunctions because of insufficient exciton separation into electrons and holes. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 988–993, 2007 |
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| Keywords: | electron transfer layer open circuit voltage photovoltaic cell rigid‐rod polymer short circuit current |
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