Dynamic halide perovskite heterojunction generates direct current. Issue 1 (11th January 2021)

• Record Type: Journal Article
• Authors: Ma, Chunqing; Kim, Bosung; Kim, Sang-Woo; Park, Nam-Gyu
• Is Part Of: Energy & environmental science. Volume 14:Issue 1(2021)
• Page Start: 374
• Page End: 381
• Publication Date: 2021-01-11
• Subjects: Energy conversion -- Periodicals; Fuel switching -- Periodicals; Environmental sciences -- Periodicals; Environmental chemistry -- Periodicals; 333.79
• DOI: 10.1039/d0ee03487h
• Languages: English
• ISSNs: 1754-5692

Abstract

Abstract : 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. Abstract : 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 (FAPbI3, MAPbI3, MAPbBr3, PEA2 PbI4, etc. ) and charge transport layer (CTL) materials (spiro-MeOTAD, PTAA, TiO2, SnO2, 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.