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Issue 11, 2013
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Depleted hole conductor-free lead halide iodide heterojunction solar cells

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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 CH3NH3PbI3/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.

Graphical abstract: Depleted hole conductor-free lead halide iodide heterojunction solar cells

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Article information


Submitted
07 Jul 2013
Accepted
04 Sep 2013
First published
04 Sep 2013

Energy Environ. Sci., 2013,6, 3249-3253
Article type
Communication

Depleted hole conductor-free lead halide iodide heterojunction solar cells

W. A. Laban and L. Etgar, Energy Environ. Sci., 2013, 6, 3249
DOI: 10.1039/C3EE42282H

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