Towards highly efficient and stable perovskite solar cells: Suppressing ion migration by inorganic boric acid stabilizer

IF 16.8 1区 材料科学 Q1 CHEMISTRY, PHYSICAL Nano Energy Pub Date : 2024-11-13 DOI:10.1016/j.nanoen.2024.110473
Kun Gao , Yingping Fan , Dachang Liu , Qiangqiang Zhao , Bingqian Zhang , Caiyun Gao , Xiaoxu Zhang , Hongpei Ji , Li Wang , Shuping Pang
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Abstract

The poor stability of organic-inorganic perovskite solar cells (PSCs) is commonly ascribed to elevated ion migration due to the low electronegativity of iodine. To address this issue, boric acid (BA) was chosen as a stabilizer for perovskite thin films. As a Lewis acid, the boric acid has an sp2 hybridized boron atom, which can readily accept a pair of electrons from the iodine ion in its vacant unhybridized p orbital, and the formation of the Pb-O bond further increases the iodide migration barrier. The significantly increased barrier of the iodine ion migration was demonstrated by the improved phase stability of the perovskite film under an electric field and the obviously enhanced stability of the perovskite films under strong ultraviolet light. The inclusion of the BA stabilizer in PSCs resulted in an enhanced power conversion efficiency (PCE) of 25.52 %. The initial efficiency of the BA-modified device was remained at 80 % after 1000 hours at 85 ℃ under around 30 % relative humidity (RH). When subjected to maximum power point tracking and 20–25 % RH, the PCE of BA-modified devices maintained an initial efficiency of 80 % after 1500 hours.

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实现高效稳定的过氧化物太阳能电池:用无机硼酸稳定剂抑制离子迁移
有机-无机包晶太阳能电池稳定性差,通常是由于碘的电负性较低,导致离子迁移率升高。为了解决这个问题,我们选择了硼酸作为包晶体薄膜的稳定剂。作为一种路易斯酸,硼酸有一个 sp2 杂化的硼原子,可以很容易地从碘离子中接受一对电子进入其空闲的非杂化 p 轨道,Pb-O 键的形成进一步增加了碘离子迁移的障碍。碘离子迁移障碍的明显增加表现在电场作用下包晶石薄膜相稳定性的提高,以及强紫外线照射下包晶石薄膜稳定性的明显增强。含有 BA 稳定剂的 PSC 的 PCE 提高了 25.52%。即使在 85 ℃、相对湿度(RH)约为 30% 的条件下老化 1000 小时,BA 改性器件的初始效率仍能保持在 80%。在最大功率点跟踪和 20-25% 相对湿度条件下,BA 改性器件的 PCE 在 1500 小时后仍能保持 80% 的初始效率。
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来源期刊
Nano Energy
Nano Energy CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
30.30
自引率
7.40%
发文量
1207
审稿时长
23 days
期刊介绍: Nano Energy is a multidisciplinary, rapid-publication forum of original peer-reviewed contributions on the science and engineering of nanomaterials and nanodevices used in all forms of energy harvesting, conversion, storage, utilization and policy. Through its mixture of articles, reviews, communications, research news, and information on key developments, Nano Energy provides a comprehensive coverage of this exciting and dynamic field which joins nanoscience and nanotechnology with energy science. The journal is relevant to all those who are interested in nanomaterials solutions to the energy problem. Nano Energy publishes original experimental and theoretical research on all aspects of energy-related research which utilizes nanomaterials and nanotechnology. Manuscripts of four types are considered: review articles which inform readers of the latest research and advances in energy science; rapid communications which feature exciting research breakthroughs in the field; full-length articles which report comprehensive research developments; and news and opinions which comment on topical issues or express views on the developments in related fields.
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