Issue 45, 2014

Efficient star-shaped hole transporting materials with diphenylethenyl side arms for an efficient perovskite solar cell

Abstract

Two symmetrical star-shaped hole transporting materials (HTMs), i.e.FA-MeOPh and TPA-MeOPh with a fused triphenylamine or triphenylamine core and diphenylethenyl side arms were synthesized. FA-MeOPh showed a strong molar absorption coefficient and a red-shifted absorption compared with TPA-MeOPh because of its planar configuration. The power conversion efficiency (PCE) of the perovskite solar cells based on FA-MeOPh and TPA-MeOPh is about 11.86% and 10.79%, in which the efficiency of former is comparable to that (12.75%) of spiro-OMeTAD based cell. The high photocurrent (18.39 mA cm−2) of FA-MeOPh based solar cell relative to TPA-MeOPh based one may be attributable to the enhanced absorption in the near-IR region for mp-TiO2/CH3NH3PbI3/HTM based cell. The high mobility and low series resistance of mp-TiO2/CH3NH3PbI3/FA-MeOPh based cell led to the high fill factor (0.698) of FA-MeOPh based solar cell relative to TPA-MeOPh based one (0.627). In addition, the FA-MeOPh based cell showed a relative stability under light soaking for 250 h. The high efficiency, relative stability, synthetically simple and inexpensive materials as the HTMs hold promise to replace the expensive spiro-OMeTAD.

Graphical abstract: Efficient star-shaped hole transporting materials with diphenylethenyl side arms for an efficient perovskite solar cell

Supplementary files

Article information

Article type
Communication
Submitted
13 Aug 2014
Accepted
22 Sep 2014
First published
24 Sep 2014

J. Mater. Chem. A, 2014,2, 19136-19140

Efficient star-shaped hole transporting materials with diphenylethenyl side arms for an efficient perovskite solar cell

H. Choi, S. Park, S. Paek, P. Ekanayake, M. K. Nazeeruddin and J. Ko, J. Mater. Chem. A, 2014, 2, 19136 DOI: 10.1039/C4TA04179H

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