Dynamic halide perovskite heterojunction generates direct current

Here, we demonstrate a dynamic perovskite device capable of converting mechanical energy into direct current (DC) electrical energy, combining two concepts: carrier generation from the triboelectric effect and carrier separation through band energy level difference. By analyzing and comparing differ...

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Veröffentlicht in:Energy & environmental science 2021-01, Vol.14 (1), p.374-381
Hauptverfasser: Ma, Chunqing, Kim, Bosung, Kim, Sang-Woo, Park, Nam-Gyu
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Sprache:eng
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Zusammenfassung:Here, we demonstrate a dynamic perovskite device capable of converting mechanical energy into direct current (DC) electrical energy, combining two concepts: carrier generation from the triboelectric effect and carrier separation through band energy level difference. By analyzing and comparing different perovskite (FAPbI 3 , MAPbI 3 , MAPbBr 3 , PEA 2 PbI 4 , etc. ) and charge transport layer (CTL) materials (spiro-MeOTAD, PTAA, TiO 2 , SnO 2 , etc. ), the key rules for determining DC output and performances are identified: (1) a suitable band alignment (band position and bandgap) between perovskite and CTL can separate the carrier transfer; (2) a large difference in work function between two layers leads to high electrical potential difference; and (3) a high carrier concentration can enhance the DC power-generating performances. Furthermore, it is found that the light illumination acts as a stimulus to current output to a large extent, which is due to the coupling effect from triboelectric and photovoltaic effects. This study provides a set of key rules to explain the mechanism and to further improve the performance of the dynamic perovskite/CTL heterojunction. Here, we demonstrate a dynamic perovskite device capable of converting mechanical energy into direct current (DC) electrical energy, combining two concepts: carrier generation from the triboelectric effect and carrier separation through band energy level difference.
ISSN:1754-5692
1754-5706
DOI:10.1039/d0ee03487h