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Modifying PTAA/Perovskite Interface via 4-Butanediol Ammonium Bromide for Efficient and Stable Inverted Perovskite Solar Cells |
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| Authors: | Yang Li Lixin Zhang Junming Xia Tanghao Liu Kaiyang Wang |
| Affiliation: | 1. Bingtuan Energy Development Institute, Shihezi University, No. 280 Beisi Road, Xinjiang Uygur Autonomous Region, Shihezi City, 832000 China;2. Bingtuan Energy Development Institute, Shihezi University, No. 280 Beisi Road, Xinjiang Uygur Autonomous Region, Shihezi City, 832000 China Key Laboratory of Advanced Energy Storage Materials and Technology, Shihezi University, Xinjiang Uygur Autonomous Region, Shihezi City, 832000 China Contribution: Funding acquisition (lead), Project administration (lead);3. Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Macao, SAR, 999078 China;4. Department of Physics, Hong Kong Baptist University, 224 Waterloo Road, Kowloon, Hong Kong SAR, 999077 China Contribution: Formal analysis (supporting), Methodology (supporting);5. Ministry of Industry and Information Technology, Key Lab of Micro–Nano Optoelectronic Information System, Harbin Institute of Technology, Shenzhen, 518055 China Contribution: Investigation (supporting) |
| Abstract: | Inverted perovskite solar cells (IPSCs) have witnessed an impressive development in recent years. However, their efficiency is still significantly behind theoretical limits, and device instabilities hinder their commercialization. Two main obstacles to further enhancing their performance via one-step deposition are: 1) the unsatisfactory film quality of perovskite and 2) the poor surface contact. To address the above issues, 4-butanediol ammonium Bromide (BD) is utilized to passivate Pb2+ defects by forming Pb N bonds and fill vacancies of formamidinium ions at the buried surface of perovskite. The wettability of poly [bis (4-phenyl) (2,4,6-triMethylphenyl) amine] films is also improved due to the formation of hydrogen bonds between PTAA and BD molecules, resulting in better surface contacts and enhanced perovskite crystallinity. As a result, BD-modified perovskite thin films show a significant increase in the mean grain size, as well as a dramatic enhancement in the PL decay lifetime. The BD-treated device exhibits an efficiency of up to 21.26%, considerably higher than the control device. Moreover, the modified devices show dramatically enhanced thermal and ambient stability compared to the control ones. This methodology paves the way to obtain high-quality perovskite films for fabricating high-performance IPSCs. |
| Keywords: | interfaces inverted perovskite solar cells PTAA stability wettability |