Efficient and stable inverted polymer solar cells using TiO2 nanoparticles and analysized by Mott-Schottky capacitance |
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| Affiliation: | 1. Institute of Super-Microstructure and Ultrafast Process in Advanced Materials, School of Physics and Electronics, Central South University, Changsha, Hunan 410083, PR China;2. Hunan Key Laboratory for Super-Microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha, Hunan 410083, PR China;3. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA;1. Institute of Super-microstructure and Ultrafast Process in Advanced Materials, School of Physics and Electronics, Central South University, Changsha, Hunan 410083, China;2. Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha, Hunan 410083, China;3. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA;1. Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, South Korea;2. Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan, ROC;1. Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, People''s Republic of China;2. School of Geographic Science, Northeast Normal University, Changchun 130024, People''s Republic of China;3. School of applied sciences, JiLin Teachers’ institute of engineering & technology, Changchun 130052, People''s Republic of China;1. Department of Energy and Materials Engineering, Dongguk University, 26 Pil-dong, 3-ga, Jung-gu, Seoul 100-715, Republic of Korea;2. School of Electrical Science and Engineering, Nanjing University, Nanjing 210093, PR China;3. IMEP-LAHC, INP-Grenoble, MINATEC, 3 Parvis Louis Neel, BP 257, 38016 Grenoble, France;4. Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, USA |
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| Abstract: | The performance of both inverted and conventional polymer solar cells (PSCs) were examined with a low-temperature, solution-processed synthesized TiO2 nanoparticles (TiO2 NPs) as the electron extraction layer. The performance of inverted PSCs based on P3HT:PCBM bulk-heterojunction with a TiO2 NPs layer was dramatically improved and the highest power conversion efficiency (PCE) of 4.56% was achieved via 24 h exposure in air, which is one of the highest PCEs for P3HT:PCBM bulk-heterojunction PSCs using TiO2 as electron extraction layer. Meanwhile, the performance of inverted PSCs was superior to regular PSCs. Mott-Schottky capacitance analysis was carried out for both inverted and regular PSCs to obtain the built-in potential, the depletion width, as well as the doping level of the active layer, which all support the performance improvement of PSCs devices with inverted structure. In addition, inverted PSCs show excellent stability in air without encapsulation. The PCE can retain 87% of its original values after 400 h exposure in air, which is much better than that of regular PSCs. The results indicate that solution-processed TiO2 NPs shows great potential applications in the fabrication of highly efficient and stable inverted PSCs as well as large-area, flexible printed PSCs. |
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| Keywords: | Polymer solar cells Inverted structure Mott-Schottky |
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