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Elucidation of the Formation Mechanism of Highly Oriented Multiphase Ruddlesden-Popper Perovskite Solar Cells

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Title
Elucidation of the Formation Mechanism of Highly Oriented Multiphase Ruddlesden-Popper Perovskite Solar Cells
Author(s)
Jang, Gyumin; Ma, Sunihl; Kwon, Hyeok-Chan; Goh, Sukyoung; Ban, Hayeon; Joon Soo Kim; Ji-Hee Kim; Moon, Jooho
Publication Date
2021-01
Journal
ACS ENERGY LETTERS, v.6, no.1, pp.249 - 260
Publisher
AMER CHEMICAL SOC
Abstract
The crystallographic orientation and phase distribution of two-dimensional Ruddlesden-Popper perovskites (2D-RPPs) should be carefully controlled to obtain high-performance 2D-RPP-based opto-electronic devices. However, these characteristics are still unclear. Herein, we systematically examine the formation mechanism of highly oriented multiphase 2D-RPPs. We argue that the 3D-like perovskites containing small organic cations nucleate first with out-of-plane (111) preferential orientation, followed by the further growth of two- dimensional perovskites incorporating bulky organic cations owing to the difference in the solubility between small and bulky cations. This spatial segregation of organic cations across the film depth induces the formation of multiple perovskite phases, which produces n-value-graded 2D-RPP films with continually upshifted band energy alignment. Highly oriented multiphase 2D-RPP films with isobutylammonium (isoBA(2)(Cs(0.02)MA(0.64)FA(0.34))(4)Pb5I6) were successfully employed as a photoabsorbers for perovskite solar cells (PSCs), exhibiting remarkable efficiency of over 16% and significantly enhanced environmental stability compared with their three-dimensional counterparts.
URI
https://pr.ibs.re.kr/handle/8788114/9517
DOI
10.1021/acsenergylett.0c02438
ISSN
2380-8195
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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