Performance improvement mechanisms of P3HT:PCBM inverted polymer solar cells using extra PCBM and extra P3HT interfacial layers |
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| Affiliation: | 1. Department of Photonics, Research Center Energy Technology and Strategy, Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701, Taiwan, ROC;2. Institute of Microelectronics, Department of Electrical Engineering, Research Center for Energy Technology and Strategy, Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701, Taiwan, ROC;1. POSTECH Organic Electronics Laboratory, Polymer Research Institute, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea;2. Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea;3. Department of Polymer Science and Engineering, Inha University, Incheon 402-751, Republic of Korea;4. Department of Nano, Medical and Polymer Materials, Yeungnam University, Gyeongsan 712-749, Republic of Korea;1. Department of Polymer Science and Engineering, Dankook University, 152, Jukjeon-ro, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Republic of Korea;2. School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Republic of Korea;1. Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan;2. ACT-C, JST, Honcho, Kawaguchi, Saitama 332-0012, Japan;1. Department of Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand;2. School of Chemistry and Center for Innovation in Chemistry, Institute of Science, Suranaree University of Technology, Muang District, Nakhon Ratchasima 30000, Thailand;3. National Nanotechnology Center, 130 Thailand Science Park, Klong Luang, Pathumthani 12120, Thailand;4. Department of Chemistry, Faculty of Science, Chaing Mai University, Chaing Mai 50200, Thailand;5. Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand;1. Department of Electrical Engineering, National Chung Hsing University, Taichung 40227, Taiwan, ROC;2. Graduate Institute of Optoelectronic Engineering, National Chung Hsing University, Taichung 40227, Taiwan, ROC;3. Center of Nanoscience & Nanotechnology, National Chung Hsing University, Taichung 40227, Taiwan, ROC |
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| Abstract: | 
A novel P3HT:PCBM inverted polymer solar cell (IPSC) was fabricated and investigated. An extra PCBM and an extra P3HT interfacial layers were inserted into the bottom side and the top side of the P3HT:PCBM absorption layer of the IPSCs to respectively enhance electron transport and hole transport to the corresponding electrodes. According to the surface energy, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) measurement results, the extra PCBM interfacial layer could let more P3HT to form on the top side of the P3HT:PCBM blends. It revealed that the non-continuous pathways of P3HT in the P3HT:PCBM absorption layer could be reduced. Consequently, the carrier recombination centers were reduced in the absorption layer of IPSCs. The power conversion efficiency (PCE) of the P3HT:PCBM IPSCs with an extra PCBM interfacial layer greatly increased from 3.39% to 4.50% in comparison to the P3HT:PCBM IPSCs without an extra PCBM interfacial layer. Moreover, the performance of the P3HT:PCBM IPSCs with an extra PCBM interfacial layer could be improved by inserting an extra P3HT interfacial layer between the absorption layer and the MoO3 layer. The PCE of the resulting IPSCs increased from 4.50% to 4.97%. |
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| Keywords: | Extra P3HT interfacial layer Extra PCBM interfacial layer Inverted polymer solar cells Non-continuous pathways |
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