Depleted hole conductor-free lead halide iodide heterojunction solar cells

Waleed Abu Laban, Lioz Etgar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

714 Scopus citations

Abstract

Lead halide perovskite is an excellent candidate for use as a light harvester in solar cells. Our work presents a depleted hole conductor free CH3NH3PbI3/TiO2 heterojunction solar cell using a thick CH3NH3PbI3 film. The CH3NH3PbI3 formed large crystals which function simultaneously as light harvesters and as hole transport materials. We performed capacitance voltage measurements, which show a depletion region which extends to both n and p sides. The built-in field of the depletion region assists in the charge separation and suppresses the back reaction of electrons from the TiO2 film to the CH3NH3PbI3 film. This depleted hole conductor free CH3NH3PbI 3/TiO2 heterojunction solar cell provides a power conversion efficiency of 8% with a current density of 18.8 mA cm-2, the highest efficiency achieved to date for perovskite based solar cells without a hole conductor.

Original languageAmerican English
Pages (from-to)3249-3253
Number of pages5
JournalEnergy and Environmental Science
Volume6
Issue number11
DOIs
StatePublished - Nov 2013

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