Depletion region effect of highly efficient hole conductor free CH 3NH3PbI3 perovskite solar cells

Sigalit Aharon, Shany Gamliel, Bat El Cohen, Lioz Etgar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

254 Scopus citations

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-CH3NH 3PbI3 junction. X-ray diffraction measurements indicate that there were no changes in the crystallographic structure of the CH 3NH3PbI3 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. This journal is

Original languageAmerican English
Pages (from-to)10512-10518
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number22
DOIs
StatePublished - 14 Jun 2014

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