Journal
NANO ENERGY
Volume 75, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104985
Keywords
CsPbI3 perovskite quantum dots; Phenethylammonium; Moisture stability; Solar cells; Electroluminescence
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Funding
- DGIST R&D Programs of the Ministry of Science and ICT of Korea [20-ET-08]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) of the Republic of Korea [2020R1C1C1003214]
- Global Frontier R&D Program on Center for Multiscale Energy System Research [2012M3A6A7054856]
- National Research Foundation under the Ministry of Science and ICT, Republic of Korea [2018R1A2B2006708]
- Korea Institute of Energy Technology Evaluation and Planning
- Ministry of Trade, Industry and Energy of the Republic of Korea [20173010013200]
- National Research Foundation of Korea [2017R1A6A3A04004987, 5199991414321] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Advances in surface chemistry and manipulation of fully inorganic CsPbI3 perovskite quantum dots (CsPbI3-QDs) have enabled improving the charge transport and photovoltaic performance of CsPbI3-QD thin films by replacing their native long-chain, insulating ligands with short-chain ligands. However, the conventional approach based on formamidinium (FA) replacement removes the hydrophobic protective layer, opening the path for moisture penetration and resulting in poor device stability. We demonstrate that short-chain and hydrophobic phenethylammonium (PEA) cations, instead of FA, are efficiently incorporated only onto CsPbI3-QD surfaces, confirmed by Fourier-transform infrared, H nuclear magnetic resonance and density functional theory calculations. PEA incorporation leads simultaneously to improved photovoltaic performance and moisture stability of resultant CsPbI3-QDs without any change in size, fully inorganic composition, and dimensionality of CsPbI3-QDs. Therefore, PEA-incorporated CsPbI3-QD solar cells show a high device power conversion efficiency of 14.1% and high moisture stability, retaining over 90% of the initial performance after 15 days under ambient conditions.
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