Journal
CHEMSUSCHEM
Volume 9, Issue 18, Pages 2620-2627Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201600674
Keywords
perovskite; pseudohalide; solar cells; structure transformation; vapor deposition
Funding
- Ministry of Science and Technology [MOST103-2221-E-006-029-MY3, MOST104-2119M-006-004, MOST 105-2623-E-006-002-ET]
- Top-Notch Project under the Headquarter of University Advancement at National Cheng Kung University - Ministry of Education, Taiwan, ROC
- Research Center for Energy Technology and Strategy (RCETS)
- Advanced Optoelectronic Technology Center (AOTC), National Cheng Kung University
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In this report, we fabricated thiocyanate-based perovskite solar cells with low-pressure vapor-assisted solution process (LP-VASP) method. Photovoltaic performances are evaluated with detailed materials characterizations. Scanning electron microscopy images show that SCN-based perovskite films fabricated using LP-VASP have long-range uniform morphology and large grain sizes up to 1m. The XRD and Raman spectra were employed to observe the characteristic peaks for both SCN-based and pure CH3NH3PbI3 perovskite. We observed that the Pb(SCN)(2) film transformed to PbI2 before the formation of perovskite film. X-ray photoemission spectra (XPS) show that only a small amount of S remained in the film. Using LP-VASP method, we fabricated SCN-based perovskite solar cells and achieved a power conversion efficiency of 12.72%. It is worth noting that the price of Pb(SCN)(2) is only 4% of PbI2. These results demonstrate that pseudo-halide perovskites are promising materials for fabricating low-cost perovskite solar cells.
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