Redirecting wet–interfacial redox pathways for efficient inverted perovskite solar cells.
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| Title: | Redirecting wet–interfacial redox pathways for efficient inverted perovskite solar cells. |
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| Authors: | Liang, Zheng (AUTHOR), Liu, Boyuan (AUTHOR), Li, Yuelong (AUTHOR), Zhang, Yalan (AUTHOR), Yang, Yi (AUTHOR), Cheng, Shengbin (AUTHOR), Ma, Linchuan (AUTHOR), Tu, Bao (AUTHOR), Liu, Hua-Chao (AUTHOR), Xu, Huifen (AUTHOR), Bao, Yuqi (AUTHOR), Fan, Minghui (AUTHOR), Zhu, Peide (AUTHOR), Zhang, Xianfu (AUTHOR), Li, Congqi (AUTHOR), Zhang, Hui (AUTHOR), Zhang, Xinyuan (AUTHOR), Li, Yuheng (AUTHOR), Chen, Guodong (AUTHOR), Liu, Cheng (AUTHOR) |
| Source: | Science. 8/20/2026, Vol. 393 Issue 6813, p800-806. 7p. |
| Subjects: | Oxidation-reduction reaction, Dimethyl sulfoxide, Solar cell efficiency, Durability, Solar cells, Surface coatings, Hydrazides, Photovoltaic power generation |
| Abstract: | Carbazole-based phosphonic acid self-assembled monolayers (SAMs) are essential for high-efficiency p-i-n perovskite solar cells. However, during processing, these SAMs inevitably contact perovskite inks, where their acidity triggers a dimethyl sulfoxide (DMSO)-mediated iodide redox reaction that imprints device performance, representing a universal bottleneck for inverted devices. We resolve this SAM-triggered redox mechanism and introduce chemistry-matched hydrazide additives to mitigate the degradation. These additives abrogate DMSO activation and redirect unwanted by-products toward benign hydrazide–formamidinium adducts. Consequently, we achieved power conversion efficiencies (PCEs) of 27.7% (certified 27.4%) in small-area (0.06 cm2) cells and 20.1% in 2.0 m2 modules, along with T95 lifetimes of ~2000 hours of maximum power point tracking (MPPT) at 85°C and ~1500 hours MPPT at 85°C and 85% relative humidity. Editor's summary: Conjugated hydrazide additives limit the adverse effect of protons from hole-selective contacts with perovskite inks. Liang et al. found that the acidity of carbazole-based phosphonic self-assembled monolayers triggered detrimental iodide redox reactions mediated by the dimethyl sulfoxide used in perovskite precursors. Hydrazine additives suppressed this reaction and created benign adducts with formamidinium cations. Certified power conversion efficiencies of 27.4% were achieved in small-area cells, and unencapsulated devices retained 95% of their efficiency after about 1500 hours of maximum power point tracking at 85°C and 85% relative humidity. —Phil Szuromi [ABSTRACT FROM AUTHOR] |
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| Database: | Psychology and Behavioral Sciences Collection |
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| Abstract: | Carbazole-based phosphonic acid self-assembled monolayers (SAMs) are essential for high-efficiency p-i-n perovskite solar cells. However, during processing, these SAMs inevitably contact perovskite inks, where their acidity triggers a dimethyl sulfoxide (DMSO)-mediated iodide redox reaction that imprints device performance, representing a universal bottleneck for inverted devices. We resolve this SAM-triggered redox mechanism and introduce chemistry-matched hydrazide additives to mitigate the degradation. These additives abrogate DMSO activation and redirect unwanted by-products toward benign hydrazide–formamidinium adducts. Consequently, we achieved power conversion efficiencies (PCEs) of 27.7% (certified 27.4%) in small-area (0.06 cm2) cells and 20.1% in 2.0 m2 modules, along with T95 lifetimes of ~2000 hours of maximum power point tracking (MPPT) at 85°C and ~1500 hours MPPT at 85°C and 85% relative humidity. Editor's summary: Conjugated hydrazide additives limit the adverse effect of protons from hole-selective contacts with perovskite inks. Liang et al. found that the acidity of carbazole-based phosphonic self-assembled monolayers triggered detrimental iodide redox reactions mediated by the dimethyl sulfoxide used in perovskite precursors. Hydrazine additives suppressed this reaction and created benign adducts with formamidinium cations. Certified power conversion efficiencies of 27.4% were achieved in small-area cells, and unencapsulated devices retained 95% of their efficiency after about 1500 hours of maximum power point tracking at 85°C and 85% relative humidity. —Phil Szuromi [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00368075 |
| DOI: | 10.1126/science.aeg8415 |
