P-Type mesoscopic NiO as an active interfacial layer for carbon counter electrode based perovskite solar cells

Zonghao Liu, Meng Zhang, Xiaobao Xu, Lingling Bu, Wenjun Zhang, Wenhui Li, Zhixin Zhao, Mingkui Wang, Yibing Cheng, Hongshan He

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112 Citations (Scopus)

Abstract

Replacement of the ZrO2 insulator layer in the state-of-the-art TiO2/ZrO2/carbon structure by mesoscopic p-type NiO particles led to 39% increase of energy conversion efficiency of hole-conductor-free organometallic perovskite heterojunction solar cells with carbon counter electrodes. In these cells, the light absorber, CH3NH3PbI3, formed instantly inside the pores of the entire TiO2/NiO/carbon layer upon sequential deposition of PbI2 and CH3NH3I. Photoluminescence, impedance spectroscopy and transient photovoltage decay measurements have revealed that introduction of NiO extended the electron lifetime and augmented the hole extraction of the counter electrode. As a result, the photocurrent and opencircuit voltage both increased, resulting in a cell with impressive energy conversion efficiency of 11.4% under AM1.5G conditions.
Original languageEnglish
Pages (from-to)3967 - 3973
Number of pages7
JournalDalton Transactions
Volume44
Issue number9
DOIs
Publication statusPublished - 2015

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