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Effect of Diphenyl phosphinic acid on cesium lead iodide perovskite stability

Abstract

Cesium lead iodide nanocrystals (NCs) are one of the best perovskites to date. The quality of CsPbI3 tends to degrade with time and many researchers have embarked on studies for improvement of CsPbI3 stability. Herein, CsPbI3 nanoparticles were synthesized via colloidal approach by varying the capping agent and the coordinating solvent. The effect of phosphinic ligand on the synthesis of CsPbI3 was assessed with the aim of getting new properties and/or improving existing properties. The stability of synthesized CsPbI3 perovskites was evaluated through photoluminescence emission over time. A nearly cubic phase of CsPbI3 was obtained through synthesis with diphenyl phosphinic acid (DPPA) in benzyl ether (BE). Smaller nanocubes with average size of 14 nm were prepared using DPPA in BE. The emission intensity lasted beyond 6 days with only 40% lost in emission compared to that of materials prepared using mixture of solvents and conventional method. In order to illustrate possible applications, the NCs were used in a simple solar cell device with configuration: substrate-FTO-TiO2-CsPbI3/NiO-Au. The power conversion efficiency and fill factor of 2.0% and 38% respectively were obtained from the 2,2’,7,7’ -tetrakis- (N,N-di-p-methoxyphenylamine)-9,9’ –spirobifluorene (spiro - MeOTAD) free solar device which was made of more stable synthesized CsPbI3.

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Publication details

The article was received on 05 Jun 2018, accepted on 27 Jul 2018 and first published on 27 Jul 2018


Article type: Paper
DOI: 10.1039/C8CE00934A
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Effect of Diphenyl phosphinic acid on cesium lead iodide perovskite stability

    K. P. Mubiayi, N. Moloto and M. J. Moloto, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00934A

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