Chem. J. Chinese Universities ›› 2016, Vol. 37 ›› Issue (9): 1605.doi: 10.7503/cjcu20160179

• Articles: Inorganic Chemistry • Previous Articles     Next Articles

Investigation on Stability of Perovskite Semiconductor CH3NH3PbI3 by In-situ FTIR Spectroscopy

LIU Yang, FU Xianwei, ZHAO Tianyu, LIAN Gang, DONG Ning, SONG Side, WANG Qilong, CUI Deliang*()   

  1. State Key Lab of Crystal Materials, Shandong University, Jinan 250100, China
  • Received:2016-03-23 Online:2016-09-10 Published:2016-08-18
  • Contact: CUI Deliang E-mail:cuidl@sdu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.51102151, 51372143)

Abstract:

Perovskite hybrid semiconductors CH3NH3PbX3(X=Cl, Br, I) have attracted much interests of the chemists and material scientists due to their advantages including facile preparation, low cost and excellent optoelectronic properties. However, the poor stability of these hybrid semiconductors severely frustrated their practical applications, thus it is very important to investigate their decomposition process and explore the new route to improve their stability. Here we investigated the thermal decomposition process of CH3NH3PbI3 using an in-situ Fourier transformation infrared(FTIR) spectrometer. It was found that the stability of CH3NH3PbI3 was rather sensitive to the existence of oxygen, it began to decompose at 150 ℃ when 1%(volume fraction) oxygen was introduced into the nitrogen atmosphere. In comparison, its decomposition temperature strikingly increased to 250 ℃ when it was heated in pure nitrogen of atmospheric pressure. It was rather surprising that the decomposition temperature of CH3NH3PbI3 further increased to 270 ℃ when the pressure of nitrogen increased to 4.0 MPa. This phenomenon reveals that the thermal stability of CH3NH3PbX3 should be greatly improved by applying an even high pressure, thus the post-treatment of photovoltaic devices could be performed at much higher temperature and even better performance can be anticipated.

Key words: Perovskite, Hybrid semiconductor, Stability, In-situ Fourier transformation infrared spectroscopy

CLC Number: 

TrendMD: