Active-layer evolution and efficiency improvement of (CH₃NH_{3 3}Bi₂I₉-based solar cell on TiO₂-deposited ITO substrate

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• 作者：Xinqian Zhang ; Gang Wu ; Zhuowei Gu ; Bing Guo ; Wenqing Liu ; Shida Yang…
• 关键词：methyl ; ammonium bismuth (III) iodide ; organic–inorganic hybrid solar cell ; TiO2 ; depostied indium tin oxide (ITO) substrate ; morphology and crystallinity ; precursor solution concentration
• 刊名：Nano Research
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：9
• 期：10
• 页码：2921-2930
• 全文大小：2,750 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chinese Library of Science
  Chemistry
  Nanotechnology
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1998-0000
• 卷排序：9

文摘

We systematically investigated the development of film morphology and crystallinity of methyl-ammonium bismuth (III) iodide (MA₃Bi₂I₉) through onestep spin-coating on TiO₂-deposited indium tin oxide (ITO)/glass. The precursor solution concentration and substrate structure have been demonstrated to be critically important in the active-layer evolution of the MA₃Bi₂I₉-based solar cell. This work successfully improved the cell efficiency to 0.42% (average: 0.38%) with the mesoscopic architecture of ITO/compact-TiO₂/mesoscopic-TiO₂ (meso-TiO₂)/MA₃Bi₂I₉/2,2′,7,7′-tetrakis(N,N-di-4-methoxyphenylamino)-9,9′spiro-bifluorene (spiro-MeOTAD)/MoO₃/Ag under a precursor concentration of 0.45 M, which provided the probability of further improving the efficiency of the Bi3+-based lead-free organic–inorganic hybrid solar cells.