https://scholars.lib.ntu.edu.tw/handle/123456789/492108
標題: | Enhancing the efficiency of perovskite solar cells using mesoscopic zinc-doped TiO <inf>2</inf> as the electron extraction layer through band alignment | 作者: | Wu, M.-C. Chan, S.-H. Lee, K.-M. Chen, S.-H. Jao, M.-H. Chen, Y.-F. YANG-FANG CHEN WEI-FANG SU |
公開日期: | 2018 | 卷: | 6 | 期: | 35 | 起(迄)頁: | 16920-16931 | 來源出版物: | Journal of Materials Chemistry A | 摘要: | Lead halide perovskite-structured solar cells (PSCs) have drawn great attention due to a rapid improvement in their photoelectric conversion efficiency in recent years. In this study, we have enhanced photovoltaic performance by using mesoscopic zinc-doped TiO2 (meso-Zn:TiO2) as the electron extraction layer. Zn:TiO2 nanoparticles (Zn:TiO2 NPs) with various zinc doping levels were synthesized by combining sol-gel and hydrothermal methods. The synthesized Zn:TiO2 NPs were used to fabricate electron extraction layers by a screen-printing method. We systematically investigated the surface morphology, crystal structure, contact angle, charge carrier dynamics, electron mobility, and electrical conductivity of various meso-Zn:TiO2. Furthermore, photo-assisted Kelvin probe force microscopy (KPFM) was used to analyze the surface potential of perovskite films coated with various meso-Zn:TiO2 to understand the electron extraction behavior under the illumination of light at various wavelengths. Moreover, the energy levels of various meso-Zn:TiO2 were estimated by ultraviolet photoelectron spectroscopy (UPS) and UV-vis absorption spectroscopy. We discovered that the 5.0 mol% meso-Zn:TiO2 exhibited the optimal band alignment with perovskite. Finally, the average power conversion efficiency (PCE) of PSCs with meso-Zn:TiO2 was enhanced from 13.1 to 16.8%, and such fabricated PSC yielded a champion PCE of 18.3%. © 2018 The Royal Society of Chemistry. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/492108 | DOI: | 10.1039/c8ta05291c | SDG/關鍵字: | Absorption spectroscopy; Contact angle; Conversion efficiency; Crystal structure; Electrons; Extraction; Lead compounds; Perovskite; Perovskite solar cells; Photoelectricity; Screen printing; Semiconductor doping; Sol-gels; Solar cells; Superconducting materials; Surface potential; Synthesis (chemical); Titanium dioxide; Ultraviolet photoelectron spectroscopy; Ultraviolet spectroscopy; Uninterruptible power systems; Charge carrier dynamics; Electrical conductivity; Hydrothermal methods; Kelvin probe force microscopy; Photo-electric conversion efficiency; Photovoltaic performance; Screen printing methods; UV-Vis absorption spectroscopy; Zinc compounds |
顯示於: | 材料科學與工程學系 |
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