Highly Efficient 17.6% Tin–Lead Mixed Perovskite Solar Cells Realized through Spike Structure
Frequently observed high V oc loss in tin–lead mixed perovskite solar cells is considered to be one of the serious bottle-necks in spite of the high attainable Jsc due to wide wavelength photon harvesting. An amicable solution to minimize the V oc loss up to 0.50 V has been demonstrated by introduci...
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Veröffentlicht in: | Nano letters 2018-06, Vol.18 (6), p.3600-3607 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Frequently observed high V oc loss in tin–lead mixed perovskite solar cells is considered to be one of the serious bottle-necks in spite of the high attainable Jsc due to wide wavelength photon harvesting. An amicable solution to minimize the V oc loss up to 0.50 V has been demonstrated by introducing an n-type interface with spike structure between the absorber and electron transport layer inspired by highly efficient Cu(In,Ga)Se2 solar cells. Introduction of a conduction band offset of ∼0.15 eV with a thin phenyl-C61-butyric acid methyl ester layer (∼25 nm) on the top of perovskite absorber resulted into improved V oc of 0.75 V leading to best power conversion efficiency of 17.6%. This enhancement is attributed to the facile charge flow at the interface owing to the reduction of interfacial traps and carrier recombination with spike structure as evidenced by time-resolved photoluminescence, nanosecond transient absorption, and electrochemical impedance spectroscopy measurements. |
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ISSN: | 1530-6984 1530-6992 |
DOI: | 10.1021/acs.nanolett.8b00701 |