期刊
ADVANCED MATERIALS
卷 29, 期 35, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201701440
关键词
convection; low temperature; perovskite solar cells; soft-cover deposition
类别
资金
- National Natural Science Foundation of China [11574199, 11674219]
- Natural Science Foundation of Shanghai [17ZR1414800]
- New Energy and Industrial Technology Development Organization (NEDO, Japan)
Large-scale high-quality perovskite thin films are crucial to produce high-performance perovskite solar cells. However, for perovskite films fabricated by solvent-rich processes, film uniformity can be prevented by convection during thermal evaporation of the solvent. Here, a scalable low-temperature soft-cover deposition (LT-SCD) method is presented, where the thermal convection-induced defects in perovskite films are eliminated through a strategy of surface tension relaxation. Compact, homogeneous, and convection-induced-defects-free perovskite films are obtained on an area of 12 cm(2), which enables a power conversion efficiency (PCE) of 15.5% on a solar cell with an area of 5 cm(2). This is the highest efficiency at this large cell area. A PCE of 15.3% is also obtained on a flexible perovskite solar cell deposited on the polyethylene terephthalate substrate owing to the advantage of presented low-temperature processing. Hence, the present LT-SCD technology provides a new non-spin-coating route to the deposition of large-area uniform perovskite films for both rigid and flexible perovskite devices.
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