Issue 22, 2014

Depletion region effect of highly efficient hole conductor free CH3NH3PbI3 perovskite solar cells

Abstract

The inorganic–organic perovskite is currently attracting a lot of attention due to its use as a light harvester in solar cells. The large absorption coefficients, high carrier mobility and good stability of organo-lead halide perovskites present good potential for their use as light harvesters in mesoscopic heterojunction solar cells. This work concentrated on a unique property of the lead halide perovskite, its function simultaneously as a light harvester and a hole conductor in the solar cell. A two-step deposition technique was used to optimize the perovskite deposition and to enhance the solar cell efficiency. It was revealed that the photovoltaic performance of the hole conductor free perovskite solar cell is strongly dependent on the depletion layer width which was created at the TiO2–CH3NH3PbI3 junction. X-ray diffraction measurements indicate that there were no changes in the crystallographic structure of the CH3NH3PbI3 perovskite over time, which supports the high stability of these hole conductor free perovskite solar cells. Furthermore, the power conversion efficiency of the best cells reached 10.85% with a fill factor of 68%, a Voc of 0.84 V, and a Jsc of 19 mA cm−2, the highest efficiency to date of a hole conductor free perovskite solar cell.

Graphical abstract: Depletion region effect of highly efficient hole conductor free CH3NH3PbI3 perovskite solar cells

Article information

Article type
Paper
Submitted
30 Jan 2014
Accepted
07 Apr 2014
First published
09 Apr 2014

Phys. Chem. Chem. Phys., 2014,16, 10512-10518

Author version available

Depletion region effect of highly efficient hole conductor free CH3NH3PbI3 perovskite solar cells

S. Aharon, S. Gamliel, B. E. Cohen and L. Etgar, Phys. Chem. Chem. Phys., 2014, 16, 10512 DOI: 10.1039/C4CP00460D

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