Print Email Facebook Twitter Guanidium-assisted crystallization engineering for highly efficient CsPbI3 solar cells Title Guanidium-assisted crystallization engineering for highly efficient CsPbI3 solar cells Author Wang, Shuo (Lanzhou University) Xu, Youkui (Lanzhou University) Wang, Qian (Lanzhou University) Zhou, Xufeng (Liaocheng University) Li, ZhenHua (Lanzhou University) Wang, Meng (Lanzhou University) Lei, Yutian (Lanzhou University) Zhang, Hong (Lanzhou University) Wang, H. (TU Delft Photovoltaic Materials and Devices) Jin, Zhiwen (Lanzhou University) Date 2022 Abstract Iodine vacancies and uncoordinated iodide ions of CsPbI3 films are mainly responsible for nonradiative recombination. Here, we report a composition-engineering passivation method that through guanidium (GA+) and I− forms strong hydrogen bonds to passivate iodine vacancies and reduce defects. Both experimental and theoretical results confirmed strong chemical interactions between GA+ and uncoordinated I− in the GAxCs1−xPbI3 bulk or at the grain boundary. Moreover, GA+ doping could slow down the crystallization speed of perovskite films during the deposition process. As a result, we observed GA+ modified films with much lower defect density, larger grain size, and better carrier extraction and transportation. Upon GA+ passivation, the power conversion efficiency (PCE) is boosted from 18.01% to 19.05%, with open-circuit voltage (VOC) enhancement from 1.08 V to 1.14 V. To reference this document use: http://resolver.tudelft.nl/uuid:c2d15bc9-93ab-4978-9d1c-76441302c247 DOI https://doi.org/10.1039/d2tc01008a Embargo date 2022-10-25 ISSN 2050-7526 Source Journal of Materials Chemistry C: materials for optical and electronic devices, 10 (21), 8234-8240 Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2022 Shuo Wang, Youkui Xu, Qian Wang, Xufeng Zhou, ZhenHua Li, Meng Wang, Yutian Lei, Hong Zhang, H. Wang, Zhiwen Jin Files PDF d2tc01008a_1_.pdf 3.72 MB Close viewer /islandora/object/uuid:c2d15bc9-93ab-4978-9d1c-76441302c247/datastream/OBJ/view