Issue 17, 2015

Enhancement of photovoltaic properties of CH3NH3PbBr3 heterojunction solar cells by modifying mesoporous TiO2 surfaces with carboxyl groups

Abstract

In a new heterojunction solar cell employing CH3NH3PbBr3 (MAPbBr3) as the light absorber, we found that the introduction of a carboxylate monolayer on the mesoporous TiO2 surfaces significantly enhances JSC as well as VOC. In particular, the presence of a bromoacetate monolayer at the interface of TiO2/MAPbBr3 remarkably increases the photovoltaic conversion efficiency (PCE) from 2.65% to 5.57% with JSC of 5.411 mA cm−2, VOC of 1.372 V, and FF of 0.75. Time-resolved photoluminescence measurements indicate that the presence of the interfacial carboxylate groups expedites electron injection from MAPbBr3 to TiO2. Furthermore, according to pulsed light-induced transient measurements (PLITM) of photocurrent analysis, the lifetime of photoinjected electrons (τe) in the TiO2 conduction band (CB) significantly increases with the passivation of the interface, implying the suppression of charge recombination as well.

Graphical abstract: Enhancement of photovoltaic properties of CH3NH3PbBr3 heterojunction solar cells by modifying mesoporous TiO2 surfaces with carboxyl groups

Article information

Article type
Paper
Submitted
26 Nov 2014
Accepted
26 Feb 2015
First published
02 Mar 2015

J. Mater. Chem. A, 2015,3, 9264-9270

Author version available

Enhancement of photovoltaic properties of CH3NH3PbBr3 heterojunction solar cells by modifying mesoporous TiO2 surfaces with carboxyl groups

H. B. Kim, I. Im, Y. Yoon, S. D. Sung, E. Kim, J. Kim and W. I. Lee, J. Mater. Chem. A, 2015, 3, 9264 DOI: 10.1039/C4TA06479H

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