期刊
ACS ENERGY LETTERS
卷 3, 期 7, 页码 1772-1778出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00926
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资金
- U.S. Department of Energy (DOE) PVRD2 program [DE-EE0008154]
- Office of Naval Research [N00014-17-1-2525]
- National Science Foundation Graduate Research Fellowship [DGE-1656518]
- Ministry of Science and Technology of Thailand Fellowship
- National Science Foundation [ECCS-1542152]
Metal-contact-induced degradation and escape of volatile species from perovskite solar cells necessitate excellent diffusion barrier layers. We show that metal-induced degradation limits thermal stability in several perovskite chemistries with Au, Cu, and Ag gridlines even when the metal is separated from the perovskite by a layer of indium tin oxide (ITO). Channels in a sputtered ITO layer that align with perovskite grain boundaries are pathways for metal and halide diffusion into or out of the perovskite. Planarizing the perovskite morphology with a spin-cast organic charge transport layer results in a subsequently deposited ITO layer that is uniform and impermeable. We show that it is critical to seal the edges of the active layers to prevent escape of volatile species. We demonstrate 1000 h thermal stability at 85 degrees C in CH3NH3PbI3 solar cells with complete-coverage silver contacts. Our barrier layer design enables long-term thermal stability of perovskite solar cells, a critical step to commercialization.
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