Suppressing Ion Migration by Synergistic Engineering of Anion and Cation toward High‐Performance Inverted Perovskite Solar Cells and Modules

Zhang, Zuolin; Li, Mengjia; Li, Ru; Zhuang, Xinmeng; Wang, Chenglin; Shang, Xueni; He, Dongmei; Chen, Jiangzhao; Chen, Cong

doi:10.1002/adma.202313860

Advanced Materials

2024

DOI: 10.1002/adma.202313860

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Suppressing Ion Migration by Synergistic Engineering of Anion and Cation toward High‐Performance Inverted Perovskite Solar Cells and Modules

Zuolin Zhang,

Mengjia Li,

Ru Li

et al.

Abstract: Ion migration‐induced intrinsic instability and large‐area fabrication pose a tough challenge for the commercial deployment of perovskite photovoltaics. Herein, we develop an interface heterojunction and metal electrode stabilization strategy by suppressing ion migration via managing lead‐based imperfections. After screening a series of cations and nonhalide anions, the ideal organic salt molecule dimethylammonium trifluoroacetate (DMATFA) consisting of dimethylammonium (DMA+) cation and trifluoroacetate (TFA−… Show more

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Cited by 7 publications

References 63 publications

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Repairing Interfacial Defects in Self‐Assembled Monolayers for High‐Efficiency Perovskite Solar Cells and Organic Photovoltaics through the SAM@Pseudo‐Planar Monolayer Strategy

Hung,

Wu,

Yang

et al. 2024

Advanced Science

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Lately, carbazole‐based self‐assembled monolayers (SAMs) are widely employed as effective hole‐selective layers (HSLs) in inverted perovskite solar cells (PSCs). Nevertheless, these SAMs tend to aggregate in solvents due to their amphiphilic nature, hindering the formation of a monolayer on the ITO substrate and impeding effective passivation of deep defects in the perovskites. In this study, a series of new SAMs including DPA‐B‐PY, CBZ‐B‐PY, POZ‐B‐PY, POZ‐PY, POZ‐T‐PY, and POZ‐BT‐PY are synthesized, which are employed as interfacial repairers and coated atop CNph SAM to form a robust CNph SAM@pseudo‐planar monolayer as HSL in efficient inverted PSCs. The CNph SAM@pseudo‐planar monolayer strategy enables a well‐aligned interface with perovskites, synergistically promoting perovskite crystal growth, improving charge extraction/transport, and minimizing nonradiative interfacial recombination loss. As a result, the POZ‐BT‐PY‐modified PSC realizes an impressively enhanced solar efficiency of up to 24.45% together with a fill factor of 82.63%. Furthermore, a wide bandgap PSC achieving over 19% efficiency. Upon treatment with the CNph SAM@pseudo‐planar monolayer, also demonstrates a non‐fullerene organic photovoltaics (OPVs) based on the PM6:BTP‐eC9 blend, which achieves an efficiency of 17.07%. Importantly, these modified PSCs and OPVs all show remarkably improved stability under various testing conditions compared to their control counterparts.

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Repairing Interfacial Defects in Self‐Assembled Monolayers for High‐Efficiency Perovskite Solar Cells and Organic Photovoltaics through the SAM@Pseudo‐Planar Monolayer Strategy

Hung,

Wu,

Yang

et al. 2024

Advanced Science

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Surface Formamidine Cation Immobilization for Efficient FA‐Based Perovskites Solar Cells

Liu,

Wang

et al. 2024

Advanced Energy Materials

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State‐of‐the‐art perovskite solar cells (PSCs) continue to encounter stability challenges throughout their current commercialization process, primarily due to the instable organic components. Especially, surface (interface) imperfections, like the undercoordinated Pb2+ and halide sites, further compromise the confinement of organic cations at the surface (interface) and provide a rapid pathway for ion migration and volatilization, decreasing stability and efficiency. Herein, the study has developed a surface Formamidine (FA) cation immobilization strategy through hydrogen bond effect, achieved by a post‐treatment of piperazine dihydrochloride (PDCl2), to obtain stable FA‐based perovskites. The piperazine can immobilize surface FA+ cation through hydrogen bond. Moreover, the post‐treatment of PDCl2 can induce surface Cl– doping to establish strong coordinating bond with the uncoordinated Pb2+, reducing the imperfections of surface octahedral cage. Such a synergistic effect effectively constrains surface FA+ cations, simultaneously alleviates surface lattice stress. Because of improved surface properties, the resultant perovskite demonstrates not only outstanding light/thermal stability, but also more pronounced n‐type characteristics and uniform potential distribution for improving charge transfer dynamics. Finally, the champion PSCs exhibit a significantly enhanced efficiency from 23.15% to 25.52%. Moreover, these PSCs exhibit excellent stability: retain 91% of their initial efficiency after over 1000 h maximum power point test.

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Managing Pb‐Related Imperfections via Rationally Designed Aniline Derivative with Bilateral Cyano and Acetyl Groups as Lewis Base for High‐Efficiency Perovskite Solar Cells Exceeding 24%

He,

Zhang,

Ding

et al. 2024

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Pb‐related imperfections (surface or halide vacancy induced uncoordinated Pb2+, Pb‐I antisite, and Pb2+ vacancy defects) of the ionic crystal perovskite film seriously restrict the photovoltaic performance of perovskite solar cells (PSCs). Here, an aniline derivative N‐(4‐cyanophenyl)acetamide (CAL) is rationally designed, incorporating bilateral functional sites of cyano and acetyl groups, acting as Lewis base molecule for managing the Pb‐related imperfections in perovskite surface through post‐treatment. Theoretical calculation and experimental verification together proved the reduced defect density, improved crystallinity, and inhibited ion migration in the CAL‐modified perovskite. Precisely, cyano as a side group and acetyl as another side group can both coordinate with Pb2+ for its low electrostatic potential energy. Further, the aniline core and the π‐π conjugate structure in the benzene ring of the ligand tend to form a dimer to improve the mobility for carrier transportation and collection. The strategy demonstrates a champion PCE of 24.35% for the air‐processed PSCs with over 1200 hours of maximum power point tracking (MPPT) stability. This study presents a comprehensive approach to overcoming the current Pb‐related imperfections induced limitations in PSCs, paving the way for their integration into mainstream solar technologies.

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Suppressing Ion Migration by Synergistic Engineering of Anion and Cation toward High‐Performance Inverted Perovskite Solar Cells and Modules

Cited by 7 publications

References 63 publications

Repairing Interfacial Defects in Self‐Assembled Monolayers for High‐Efficiency Perovskite Solar Cells and Organic Photovoltaics through the SAM@Pseudo‐Planar Monolayer Strategy

Repairing Interfacial Defects in Self‐Assembled Monolayers for High‐Efficiency Perovskite Solar Cells and Organic Photovoltaics through the SAM@Pseudo‐Planar Monolayer Strategy

Surface Formamidine Cation Immobilization for Efficient FA‐Based Perovskites Solar Cells

Managing Pb‐Related Imperfections via Rationally Designed Aniline Derivative with Bilateral Cyano and Acetyl Groups as Lewis Base for High‐Efficiency Perovskite Solar Cells Exceeding 24%

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