Min Hyeong Lee, Dae Woo Kim, Young Wook Noh, Hye Seung Kim, Jongmin Han, Heunjeong Lee, Kyoung Jin Choi, Shinuk Cho* and Myoung Hoon Song*,
{"title":"通过序贯真空沉积实现全无机 CsPbI2Br 的可控晶体生长,从而实现高效的 Perovskite 太阳能电池","authors":"Min Hyeong Lee, Dae Woo Kim, Young Wook Noh, Hye Seung Kim, Jongmin Han, Heunjeong Lee, Kyoung Jin Choi, Shinuk Cho* and Myoung Hoon Song*, ","doi":"10.1021/acsnano.4c03079","DOIUrl":null,"url":null,"abstract":"<p >Vacuum deposition of perovskites is a promising method for scale-up fabrication and uniform film growth. However, improvements in the photovoltaic performance of perovskites are limited by the fabrication of perovskite films, which are not optimized for high device efficiency in the vacuum evaporation process. Herein, we fabricate CsPbI<sub>2</sub>Br perovskite with high crystallinity and larger grain size by controlling the deposition sequence between PbI<sub>2</sub> and CsBr. The nucleation barrier for perovskite formation is significantly lowered by first evaporating CsBr and then PbI<sub>2</sub> (CsBr–PbI<sub>2</sub>), followed by the sequential evaporation of multiple layers. The results show that the reduced Gibbs free energy of CsBr–PbI<sub>2</sub>, compared with that of PbI<sub>2</sub>–CsBr, accelerates perovskite formation, resulting in larger grain size and reduced defect density. Furthermore, surface-modified homojunction perovskites are fabricated to efficiently extract charge carriers and enhance the efficiency of perovskite solar cells (PeSCs) by modulating the final PbI<sub>2</sub> thickness before thermal annealing. Using these strategies, the best PeSC exhibits a power conversion efficiency of 13.41% for a small area (0.135 cm<sup>2</sup>), the highest value among sequential thermal deposition inorganic PeSCs, and 11.10% for a large area PeSC (1 cm<sup>2</sup>). This study presents an effective way to understand the crystal growth of thermally deposited perovskites and improve their performance in optoelectronic devices.</p>","PeriodicalId":21,"journal":{"name":"ACS Nano","volume":null,"pages":null},"PeriodicalIF":15.8000,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Controlled Crystal Growth of All-Inorganic CsPbI2Br via Sequential Vacuum Deposition for Efficient Perovskite Solar Cells\",\"authors\":\"Min Hyeong Lee, Dae Woo Kim, Young Wook Noh, Hye Seung Kim, Jongmin Han, Heunjeong Lee, Kyoung Jin Choi, Shinuk Cho* and Myoung Hoon Song*, \",\"doi\":\"10.1021/acsnano.4c03079\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Vacuum deposition of perovskites is a promising method for scale-up fabrication and uniform film growth. However, improvements in the photovoltaic performance of perovskites are limited by the fabrication of perovskite films, which are not optimized for high device efficiency in the vacuum evaporation process. Herein, we fabricate CsPbI<sub>2</sub>Br perovskite with high crystallinity and larger grain size by controlling the deposition sequence between PbI<sub>2</sub> and CsBr. The nucleation barrier for perovskite formation is significantly lowered by first evaporating CsBr and then PbI<sub>2</sub> (CsBr–PbI<sub>2</sub>), followed by the sequential evaporation of multiple layers. The results show that the reduced Gibbs free energy of CsBr–PbI<sub>2</sub>, compared with that of PbI<sub>2</sub>–CsBr, accelerates perovskite formation, resulting in larger grain size and reduced defect density. Furthermore, surface-modified homojunction perovskites are fabricated to efficiently extract charge carriers and enhance the efficiency of perovskite solar cells (PeSCs) by modulating the final PbI<sub>2</sub> thickness before thermal annealing. Using these strategies, the best PeSC exhibits a power conversion efficiency of 13.41% for a small area (0.135 cm<sup>2</sup>), the highest value among sequential thermal deposition inorganic PeSCs, and 11.10% for a large area PeSC (1 cm<sup>2</sup>). This study presents an effective way to understand the crystal growth of thermally deposited perovskites and improve their performance in optoelectronic devices.</p>\",\"PeriodicalId\":21,\"journal\":{\"name\":\"ACS Nano\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":15.8000,\"publicationDate\":\"2024-06-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Nano\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acsnano.4c03079\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Nano","FirstCategoryId":"88","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsnano.4c03079","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Controlled Crystal Growth of All-Inorganic CsPbI2Br via Sequential Vacuum Deposition for Efficient Perovskite Solar Cells
Vacuum deposition of perovskites is a promising method for scale-up fabrication and uniform film growth. However, improvements in the photovoltaic performance of perovskites are limited by the fabrication of perovskite films, which are not optimized for high device efficiency in the vacuum evaporation process. Herein, we fabricate CsPbI2Br perovskite with high crystallinity and larger grain size by controlling the deposition sequence between PbI2 and CsBr. The nucleation barrier for perovskite formation is significantly lowered by first evaporating CsBr and then PbI2 (CsBr–PbI2), followed by the sequential evaporation of multiple layers. The results show that the reduced Gibbs free energy of CsBr–PbI2, compared with that of PbI2–CsBr, accelerates perovskite formation, resulting in larger grain size and reduced defect density. Furthermore, surface-modified homojunction perovskites are fabricated to efficiently extract charge carriers and enhance the efficiency of perovskite solar cells (PeSCs) by modulating the final PbI2 thickness before thermal annealing. Using these strategies, the best PeSC exhibits a power conversion efficiency of 13.41% for a small area (0.135 cm2), the highest value among sequential thermal deposition inorganic PeSCs, and 11.10% for a large area PeSC (1 cm2). This study presents an effective way to understand the crystal growth of thermally deposited perovskites and improve their performance in optoelectronic devices.
期刊介绍:
ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.