Efficient and stable photoelectrochemistry of hybrid materials
Hsien-Yi Hsu a
a City University of Hong Kong, Tat Chee Avenue, 83, Hong Kong, Hong Kong
nanoGe Perovskite Conferences
Proceedings of International online conference on Hybrid materials and optoelectronic devices (HYBRIDOE)
Online, Spain, 2020 December 15th - 17th
Organizers: Xueqing Xu, Baomin Xu, Hin-Lap (Angus) Yip and Xinhua Zhong
Oral, Hsien-Yi Hsu, presentation 017
DOI: https://doi.org/10.29363/nanoge.hybridoe.2020.017
Publication date: 4th December 2020

For the first of time, we demonstrate that methylammonium cadmium halides show photoelectrochemical (PEC) response with excellent humidity and chemical resistance because the oxidation  state of almost all cadmium  compounds  is  +2.  The  photocurrent  densities  of  two-dimensional  (2D)  layered  (MA)2CdCl4 perovskites  are  about  0.30  mAcm-2  under  100  mWcm-2  irradiation.  The  interaction  between  these methylammonium cadmium halides and water vapor is studied by probing film morphology and characterizing single crystal structure. It is shown that H2O is able to complex with the perovskite, forming a hydrate product with  the  molecular  formula  of  MACd3Cl7•3H2O  upon  humidity  exposure.  This  causes  a  decrease  in absorption and a recognizable change in the crystal structure of the material. When compared to methyl- ammonium lead iodide (MAPbI3), the PEC stability of 2D layered (MA)2CdCl4 perovskites with BQ/BQ•- redox couples (where BQ is benzoquinone) in CH2Cl2 is enhanced from 50 hours to 600 hours, exhibiting an increase of 12 times.

The authors acknowledge financial support from the Research Grants Council of Hong Kong (grant no. 21203518, 8730049 and 9048121), City University of Hong Kong (grant no. 7005289, 7005580, 9680208, 9667213 and 9052029), and Shenzhen Science Technology and Innovation Commission (grant no. R-IND12302).

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