Carboxyl-functionalized perovskite enables ALD growth of a compact and uniform ion migration barrier

IF 38.6 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Joule Pub Date : 2025-03-19 DOI:10.1016/j.joule.2024.12.002

Deokjae Choi , Donghoon Shin , Chongwen Li , Yuan Liu , Abdulaziz S.R. Bati , Dana E. Kachman , Yi Yang , Jiachen Li , Yoon Jung Lee , Muzhi Li , Saivineeth Penukula , Da Bin Kim , Heejong Shin , Chiung-Han Chen , So Min Park , Cheng Liu , Aidan Maxwell , Haoyue Wan , Nicholas Rolston , Edward H. Sargent , Bin Chen

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引用次数: 0

Abstract

Mixed-halide wide-band-gap perovskites are critical components of highly efficient tandem cells, but their operating stability is limited by halide migration. Metal oxides deposited via atomic layer deposition (ALD) have been shown to block halide migration; however, previously pursued methods result in inhomogeneous nucleation and growth. We hypothesized that functionalizing the perovskite surface with ALD-active carboxyl groups could promote nucleation and enable higher-temperature metal oxide growth. We find that 5-ammonium valeric acid iodide (5-AVAI) facilitates the formation of a compact and uniform aluminum oxide (Al₂O₃) layer and allows growth at 100°C compared with the previous limit of 75°C. We demonstrate that halide migration into the C₆₀ electron transport layer is reduced by a factor of 10 compared with the reference case. Al₂O₃-capped perovskite solar cells with a band gap of 1.78 eV retain 90% of their initial power conversion efficiency after 1,000 h of continuous operation under 1-sun illumination at 55°C.

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羧基官能化钙钛矿使ALD生长成致密均匀的离子迁移屏障

混合卤化物宽带隙钙钛矿是高效串联电池的重要组成部分，但其工作稳定性受到卤化物迁移的限制。通过原子层沉积（ALD）沉积的金属氧化物已被证明可以阻止卤化物的迁移；然而，以前追求的方法导致不均匀的成核和生长。我们假设用ald活性羧基功能化钙钛矿表面可以促进成核并使高温金属氧化物生长。我们发现，5-戊酸碘化铵（5-AVAI）有利于形成致密均匀的氧化铝（Al2O3）层，并允许在100℃下生长，而之前的极限为75℃。我们证明了卤化物向C60电子传输层的迁移比参考情况减少了10倍。带隙为1.78 eV的al2o3封顶钙钛矿太阳能电池在55°C的1个太阳照射下连续工作1,000 h后，其初始功率转换效率仍保持90%。

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来源期刊

Joule Energy-General Energy

CiteScore

53.10

自引率

2.00%

发文量

198

期刊介绍： Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.