Solvent-Engineering Method to Deposit Compact Bismuth-Based Thin Films: Mechanism and Application to Photovoltaics
| Autor: | Seong Sik Shin, Jason J. Yoo, Moungi G. Bawendi, Tonio Buonassisi, Sarah Wieghold, Rachel C. Kurchin, Alex Polizzotti, Juan Pablo Correa Baena |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry General Chemical Engineering Photovoltaic system Energy conversion efficiency chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Bismuth Formamidinium chemistry Photovoltaics Caesium Materials Chemistry Optoelectronics Thin film 0210 nano-technology business Perovskite (structure) |
| Zdroj: | Chemistry of Materials. 30:336-343 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.7b03227 |
| Popis: | Bismuth-based materials have been studied as alternatives to lead-based perovskite materials for photovoltaic applications. However, poor film quality has limited device performance. In this work, we developed a solvent-engineering method and show that it is applicable to several bismuth-based compounds. Through this method, we obtained compact films of methylammonium bismuth iodide (MBI), cesium bismuth iodide (CBI), and formamidinium bismuth iodide (FBI). On the basis of film growth theory and experimental analyses, we propose a possible mechanism of film formation. Additionally, we demonstrate that the resultant compact MBI film is more suitable to fabricate efficient and stable photovoltaic devices compared to baseline MBI films with pinholes. We further employed a new hole-transporting material to reduce the valence-band offset with the MBI. The best-performing photovoltaic device exhibits an open-circuit voltage of 0.85 V, fill factor of 73%, and a power conversion efficiency of 0.71%, the highest r... |
| Databáze: | OpenAIRE |
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