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Long Minority-Carrier Diffusion Length and Low Surface-Recombination Velocity in Inorganic Lead-Free CsSnI 3 Perovskite Crystal for Solar Cells
Wu B.3; Zhou Y.2; Xing G.3; Xu Q.3; Garces H.F.2; Solanki A.3; Goh T.W.3; Padture N.P.2; Sum T.C.3
2017-02-17
Source PublicationAdvanced Functional Materials
ISSN16163028 1616301X
Volume27Issue:7
AbstractSn-based perovskites are promising Pb-free photovoltaic materials with an ideal 1.3 eV bandgap. However, to date, Sn-based thin film perovskite solar cells have yielded relatively low power conversion efficiencies (PCEs). This is traced to their poor photophysical properties (i.e., short diffusion lengths (<30 nm) and two orders of magnitude higher defect densities) than Pb-based systems. Herein, it is revealed that melt-synthesized cesium tin iodide (CsSnI ) ingots containing high-quality large single crystal (SC) grains transcend these fundamental limitations. Through detailed optical spectroscopy, their inherently superior properties are uncovered, with bulk carrier lifetimes reaching 6.6 ns, doping concentrations of around 4.5 × 10 cm , and minority-carrier diffusion lengths approaching 1 µm, as compared to their polycrystalline counterparts having ≈54 ps, ≈9.2 × 10 cm , and ≈16 nm, respectively. CsSnI SCs also exhibit very low surface recombination velocity of ≈2 × 10 cm s , similar to Pb-based perovskites. Importantly, these key parameters are comparable to high-performance p-type photovoltaic materials (e.g., InP crystals). The findings predict a PCE of ≈23% for optimized CsSnI SCs solar cells, highlighting their great potential.
Keywordcarrier dynamics diffusion lengths lead-free perovskite crystals surface recombination velocity
DOI10.1002/adfm.201604818
URLView the original
Language英語
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Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Universidade de Macau
2.Brown University
3.Nanyang Technological University
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GB/T 7714
Wu B.,Zhou Y.,Xing G.,et al. Long Minority-Carrier Diffusion Length and Low Surface-Recombination Velocity in Inorganic Lead-Free CsSnI 3 Perovskite Crystal for Solar Cells[J]. Advanced Functional Materials,2017,27(7).
APA Wu B..,Zhou Y..,Xing G..,Xu Q..,Garces H.F..,...&Sum T.C..(2017).Long Minority-Carrier Diffusion Length and Low Surface-Recombination Velocity in Inorganic Lead-Free CsSnI 3 Perovskite Crystal for Solar Cells.Advanced Functional Materials,27(7).
MLA Wu B.,et al."Long Minority-Carrier Diffusion Length and Low Surface-Recombination Velocity in Inorganic Lead-Free CsSnI 3 Perovskite Crystal for Solar Cells".Advanced Functional Materials 27.7(2017).
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