Kun Gao , Yingping Fan , Dachang Liu , Qiangqiang Zhao , Bingqian Zhang , Caiyun Gao , Xiaoxu Zhang , Hongpei Ji , Li Wang , Shuping Pang
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引用次数: 0
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.
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.