Hot Hole Transfer Dynamics from CsPbBr3 Perovskite Nanocrystals
Transfer of the hot charge carriers prior to their cooling to the band-edge states can enhance the efficiency of a semiconductor-based solar cell much beyond its Shockley–Queisser (SQ) limiting value. Herein, we explore transfer of hot holes from the APbBr3 nanocrystals (NCs) employing a carefully c...
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Published in | ACS energy letters Vol. 5; no. 7; pp. 2246 - 2252 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
10.07.2020
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Online Access | Get full text |
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Summary: | Transfer of the hot charge carriers prior to their cooling to the band-edge states can enhance the efficiency of a semiconductor-based solar cell much beyond its Shockley–Queisser (SQ) limiting value. Herein, we explore transfer of hot holes from the APbBr3 nanocrystals (NCs) employing a carefully chosen molecular system, 4-mercaptophenol. Ultrafast pump–probe and fluorescence measurements indeed confirm this transfer process, whose efficiency depends on the energy content of the hole, and a maximum efficiency of ∼43% is achieved with CsPbBr3 NCs for a photoexcitation energy of ∼1.46E g (E g is the band gap of the NCs). While the estimated hot hole cooling and transfer rates are quite comparable, hole transfer from the band edge is found to be a significantly slower process. The findings of the present study suggest that exceeding the SQ efficiency of the solar cells based on the perovskites can indeed be a reality. |
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ISSN: | 2380-8195 2380-8195 |
DOI: | 10.1021/acsenergylett.0c01063 |