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The Influence of CsBr on Crystal Orientation and Optoelectronic Properties of MAPbI(3)-Based Solar Cells
Tech Univ Munich, Phys Dept, Lehrstuhl Funkt Mat, D-85748 Garching, Germany..
Renmin Univ China, Dept Chem, Beijing 100872, Peoples R China..
Univ Munich LMU, Chair Phys Chem, Dept Chem, D-81377 Munich, Germany.;Univ Munich LMU, Ctr NanoSci CeNS, D-81377 Munich, Germany..
Tech Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany.;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..ORCID iD: 0000-0003-2413-6079
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2022 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 14, no 2, p. 2958-2967Article in journal (Refereed) Published
Abstract [en]

Crystal orientations are closely related to the behavior of photogenerated charge carriers and are vital for controlling the optoelectronic properties of perovskite solar cells. Herein, we propose a facile approach to reveal the effect of lattice plane orientation distribution on the charge carrier kinetics via constructing CsBr-doped mixed cation perovskite phases. With grazing-incidence wide-angle X-ray scattering measurements, we investigate the crystallographic properties of mixed perovskite films at the microscopic scale and reveal the effect of the extrinsic CsBr doping on the stacking behavior of the lattice planes. Combined with transient photocurrent, transient photovoltage, and space-charge-limited current measurements, the transport dynamics and recombination of the photogenerated charge carriers are characterized. It is demonstrated that CsBr compositional engineering can significantly affect the perovskite crystal structure in terms of the orientation distribution of crystal planes and passivation of trap-state densities, as well as simultaneously facilitate the photogenerated charge carrier transport across the absorber and its interfaces. This strategy provides unique insight into the underlying relationship between the stacking pattern of crystal planes, photogenerated charge carrier transport, and optoelectronic properties of solar cells.

Place, publisher, year, edition, pages
American Chemical Society (ACS) , 2022. Vol. 14, no 2, p. 2958-2967
Keywords [en]
perovskite solar cells, crystal orientation, GIWAXS, charge carrier dynamics, stability
National Category
Condensed Matter Physics Physical Chemistry Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-310657DOI: 10.1021/acsami.1c22184ISI: 000768619500048PubMedID: 34989234Scopus ID: 2-s2.0-85122754360OAI: oai:DiVA.org:kth-310657DiVA, id: diva2:1650201
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QC 20220406

Available from: 2022-04-06 Created: 2022-04-06 Last updated: 2022-06-25Bibliographically approved

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Roth, Stephan V.

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Eichhorn, JohannaYin, ShanshanReus, Manuel A.Xiao, TianxiaoPratap, ShambhaviLiang, SuzheWeindl, Christian L.Schwartzkopf, MatthiasRoth, Stephan V.
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