Spontaneous interface engineering for dopant-free poly(3-hexylthiophene) perovskite solar cells with efficiency over 24
Halide perovskite solar cells (PSCs) have recently shown a leap forward in performance by reducing the recombination loss at the interface between the perovskite and hole-transporting layers through surface treatment. However, additional surface treatment processes such as spin-coating or annealing...
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Veröffentlicht in: | Energy & environmental science 2021-04, Vol.14 (4), p.2419-2428 |
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Sprache: | eng |
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Zusammenfassung: | Halide perovskite solar cells (PSCs) have recently shown a leap forward in performance by reducing the recombination loss at the interface between the perovskite and hole-transporting layers through surface treatment. However, additional surface treatment processes such as spin-coating or annealing are undesirable for commercialization in terms of the production cost. In addition, commonly used organic hole-transporting materials (HTMs) such as 2,2′,7,7′-tetrakis[
N
,
N
-di(4methoxylphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD) and poly(triarylamine) (PTAA) are used with hygroscopic additives, which deteriorate the long-term stability and hinder the commercialization of PSCs. Herein, we report an efficient strategy for interface engineering by directly incorporating gallium(
iii
) acetylacetonate (Ga(acac)
3
) into HTMs without subsequent processes and hygroscopic dopants. The incorporated Ga(acac)
3
spontaneously interacts with the surface of the perovskite layer, yielding a reduction of the interfacial recombination loss for various organic HTMs. In particular, by applying Ga(acac)
3
in poly(3-hexylthiophene) (P3HT), the PSCs showed a significant improvement in the power conversion efficiency (PCE) from 17.7% for the control device to 21.8%. The Ga(acac)
3
-devices also showed superior moisture stability for 2000 hours under 85% relative humidity at room temperature without any encapsulation, maintaining a complete initial performance. We also demonstrated that the incorporated Ga(acac)
3
successfully works on the best-known PSCs with the aligned P3HT, showing an enhanced PCE of 24.6%. We believe that this work presents a route for the high performance and commercialization of PSCs.
Halide perovskite solar cells (PSCs) have recently shown a leap forward in performance by reducing the recombination loss at the interface between the perovskite and hole-transporting layers through surface treatment. |
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ISSN: | 1754-5692 1754-5706 |
DOI: | 10.1039/d0ee03312j |