{"title":"光照对金属卤化物钙钛矿中离子迁移的调控","authors":"Jinbao Han, , , Shengjian Qin, , , Huan Liu, , , Menghan Chen, , , Zixuan Shang, , , Boru Tian, , , Zishang Liang, , , Mengxi Lv, , , Yanli Zeng, , and , Jinjin Zhao*, ","doi":"10.1021/acs.jpclett.5c02483","DOIUrl":null,"url":null,"abstract":"<p >Ion migration in CsPbBr<sub>3</sub> perovskites, crucial for device stability and performance, is investigated under combined illumination and direct current (DC) or alternating current (AC) bias using macroelectrical and nanoscale microscopy. DC measurements demonstrate that illumination suppresses bias-induced ion migration, reducing the current drop amplitude (Δ<i>I</i>/<i>I</i>) from 60.68% (dark) to 18.19% (3.80 mW/cm<sup>2</sup>), attributed to photogenerated carrier passivating vacancies. Photocurrent atomic force microscopy reveals grain boundaries as preferential migration pathways under light, exhibiting 9.6-fold higher mechanical work dissipation than grains. Under AC bias, illumination enhances polarization, evidenced by an +8° out-of-plane phase shift in piezoresponse force microscopy, and increases surface potential (Kelvin probe force microscopy: 2.35 V dark to 3.27 V), confirming light-promoted ion migration via polarization modulation. These findings elucidate the mechanism of light-regulated ion migration in CsPbBr<sub>3</sub>, facilitating optimization of the perovskite device stability and performance.</p>","PeriodicalId":62,"journal":{"name":"The Journal of Physical Chemistry Letters","volume":"16 39","pages":"10042–10048"},"PeriodicalIF":4.6000,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Illumination Regulated Ion Migration in Metal Halide Perovskite\",\"authors\":\"Jinbao Han, , , Shengjian Qin, , , Huan Liu, , , Menghan Chen, , , Zixuan Shang, , , Boru Tian, , , Zishang Liang, , , Mengxi Lv, , , Yanli Zeng, , and , Jinjin Zhao*, \",\"doi\":\"10.1021/acs.jpclett.5c02483\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Ion migration in CsPbBr<sub>3</sub> perovskites, crucial for device stability and performance, is investigated under combined illumination and direct current (DC) or alternating current (AC) bias using macroelectrical and nanoscale microscopy. DC measurements demonstrate that illumination suppresses bias-induced ion migration, reducing the current drop amplitude (Δ<i>I</i>/<i>I</i>) from 60.68% (dark) to 18.19% (3.80 mW/cm<sup>2</sup>), attributed to photogenerated carrier passivating vacancies. Photocurrent atomic force microscopy reveals grain boundaries as preferential migration pathways under light, exhibiting 9.6-fold higher mechanical work dissipation than grains. Under AC bias, illumination enhances polarization, evidenced by an +8° out-of-plane phase shift in piezoresponse force microscopy, and increases surface potential (Kelvin probe force microscopy: 2.35 V dark to 3.27 V), confirming light-promoted ion migration via polarization modulation. These findings elucidate the mechanism of light-regulated ion migration in CsPbBr<sub>3</sub>, facilitating optimization of the perovskite device stability and performance.</p>\",\"PeriodicalId\":62,\"journal\":{\"name\":\"The Journal of Physical Chemistry Letters\",\"volume\":\"16 39\",\"pages\":\"10042–10048\"},\"PeriodicalIF\":4.6000,\"publicationDate\":\"2025-09-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"The Journal of Physical Chemistry Letters\",\"FirstCategoryId\":\"1\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acs.jpclett.5c02483\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Journal of Physical Chemistry Letters","FirstCategoryId":"1","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.jpclett.5c02483","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Illumination Regulated Ion Migration in Metal Halide Perovskite
Ion migration in CsPbBr3 perovskites, crucial for device stability and performance, is investigated under combined illumination and direct current (DC) or alternating current (AC) bias using macroelectrical and nanoscale microscopy. DC measurements demonstrate that illumination suppresses bias-induced ion migration, reducing the current drop amplitude (ΔI/I) from 60.68% (dark) to 18.19% (3.80 mW/cm2), attributed to photogenerated carrier passivating vacancies. Photocurrent atomic force microscopy reveals grain boundaries as preferential migration pathways under light, exhibiting 9.6-fold higher mechanical work dissipation than grains. Under AC bias, illumination enhances polarization, evidenced by an +8° out-of-plane phase shift in piezoresponse force microscopy, and increases surface potential (Kelvin probe force microscopy: 2.35 V dark to 3.27 V), confirming light-promoted ion migration via polarization modulation. These findings elucidate the mechanism of light-regulated ion migration in CsPbBr3, facilitating optimization of the perovskite device stability and performance.
期刊介绍：
The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.
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