Issue 38, 2019

Skillfully deflecting the question: a small amount of piperazine-1,4-diium iodide radically enhances the thermal stability of CsPbI3 perovskite

Abstract

Inorganic CsPbI3 perovskite holds great promise to prepare high-performance and long-term operational perovskite solar cells (PSCs) because of its ideal band gap and intrinsic superb stability. However, due to the low tolerance factor, the photoactive CsPbI3 perovskite is a high-temperature (330 °C) phase that would spontaneously transit to a non-perovskite phase at ambient temperature. Herein, we incorporate piperazine-1,4-diium iodide (PZDI2) into CsPbI3 perovskite to stabilize the photoactive phase. PZD cations are proved to be inserted between layered perovskites to form a Ruddlesden–Popper 2D structure. Excitingly, a small amount of PZDI2 (3%) radically enhances the thermal stability of the CsPbI3 perovskite. Specifically, the CsPbI3·3%PZDI2 film exhibits no phase transition after heating at 100 °C for 24 h, whereas the pristine CsPbI3 and MAPbI3 films are seriously degraded after 16 h and 12 h, respectively. The carbon-based PSCs without the hole transport material (C-PSCs) using the CsPbI3·3%PZDI2 film show almost no performance decay after storage in air atmosphere at room temperature for 1200 h and at 85 °C for 200 h, whereas at 85 °C, the pristine CsPbI3 and MAPbI3 devices inflict over 20% decay after 40 h and 6 h, respectively.

Graphical abstract: Skillfully deflecting the question: a small amount of piperazine-1,4-diium iodide radically enhances the thermal stability of CsPbI3 perovskite

Supplementary files

Article information

Article type
Communication
Submitted
02 Jul 2019
Accepted
15 Sep 2019
First published
16 Sep 2019

J. Mater. Chem. C, 2019,7, 11757-11763

Skillfully deflecting the question: a small amount of piperazine-1,4-diium iodide radically enhances the thermal stability of CsPbI3 perovskite

H. Wang, S. Xiang, W. Li, H. Liu, L. Zhu, S. Xiao, S. Yang and H. Chen, J. Mater. Chem. C, 2019, 7, 11757 DOI: 10.1039/C9TC03576A

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