Journal
DALTON TRANSACTIONS
Volume 44, Issue 9, Pages 3967-3973Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4dt02904f
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Funding
- National Basic Research Program of China (973 program) [2011CBA00703]
- Fundamental Research Funds for the Central Universities [HUST: 2014TS016]
- NSFC [21103057]
- Program of New Century Excellent Talents in University [NCET-10-0416]
- CME
- Council on Faculty Research
- President's Fund for Research and Creative Activity, Eastern Illinois University
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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.
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