Journal
JOURNAL OF POWER SOURCES
Volume 319, Issue -, Pages 111-115Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.04.062
Keywords
Hole transport material free; Perovskite solar cell; Solvent treatment; Morphology control
Funding
- National Basic Research Program of China [2011CB933300]
- National Science Fund for Distinguished Young Scholars [50125309]
- National Natural Science Foundation of China [51272184, 91433203]
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The morphology of PbI2 film plays a critical role in determining the quality of the resultant CH3NH3PbI3 film and power conversion efficiency of CH3NH3PbI3 perovskite solar cell. Here, we propose a solvent treatment method in the two-step sequential deposition process to control the morphology of PbI2 film, which leads to enhanced power conversion efficiency. Hole transport material free perovskite solar cell is chosen as a paradigm to demonstrate this idea. Solvent (isopropanol, chlorobenzene, or ethanol) treated PbI2 films exhibit dendrite-like or flake-like morphologies, which facilitate more complete conversion of PbI2 to CH3NH3PbI3 perovskite in ambient atmosphere with a relative high humidity. Therefore, enhanced performance is obtained with the solvent treated PbI2 films. Average power conversion efficiency has been improved from 9.42% in the traditional two-step sequential deposition to 11.22% in solar cells derived from ethanol treated PbI2 films. (C) 2016 Elsevier B.V. All rights reserved.
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