Journal
ACS ENERGY LETTERS
Volume 4, Issue 1, Pages 278-284Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b02216
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Funding
- JSPS KAKENHI [18H02079, 18H01888]
- [NRF-2016M1A2A2940912]
- [2015M1A2A2054996]
- Grants-in-Aid for Scientific Research [18H01888] Funding Source: KAKEN
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Sn-based perovskite solar cells (PSCs) featuring high performance and long-term stability are very challenging because Sn2+ is relatively prone to oxidation. Here, we have performed coadditive engineering with 5-ammonium valeric acid iodide (5-AVAI) for FASnI(3)-based perovskite films. From the morphological, structural, and elemental analyses, we observed that 5-AVAI affects the crystal growth of perovskites through its hydrogen bond with I- of the SnI64- octahedral. As a result, pinhole-free homogeneous and stable Sn-based perovskite films form over a large area with lower Sn4+ content. This made us able to enhance the power conversion efficiency (PCE) for Sn-based PSCs up to 7% in a 0.25 cm(2) aperture area. Most importantly, the 5-AVAI added PSCs showed a record stability and maintained their initial PCE under 1 sun continuous illumination at maximum power point tracking for 100 h.
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