Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 43, Pages 24008-24015Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b06780
Keywords
organic lead iodide; solvent annealing; crystallization; film growth; solar cell; PCBM
Funding
- National Nature Science Foundation of China [51202227]
- Science and Technology Development Foundation of China Academy of Engineering Physics [2014A0302015, 2014B0302054]
- Synergistic Innovation Joint Foundation of CAEP-SCU [XTCX2014008]
- Sichuan International Cooperation Research Project [2014HH0068]
- Fundamental Research Funds for the Central Universities of China [2672012ZYGX2012J065]
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Organic inorganic halide perovsldte-based thin film solar cells show excellent light-to-power conversion efficiency. The high performance for the devices requires the preparation of well-crystallized perovskite absorbers. In this paper, we used the postannealing process to treat the perovskite films under different solvent vapors and observed that the solvent vapors have a strong effect on the film growth. A model regarding the perovskite film growth was proposed as well. Intensive characterizations including scanning electron microscopy, electrochemical impedance spectroscopy, and admittance spectroscopy allowed us to attribute the improved performance to reduced recombination loss and defect density. Solar cell based on the DMSO-treated films delivered a power conversion efficiency of over 13% with negligible photocurrent hysteresis.
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