TY  - JOUR
AU  - Buyan-Arivjikh, Altantulga
AU  - Fricker, Jascha
AU  - Baier, Thomas
AU  - Ci, Xiaojing
AU  - Li, Lixing
AU  - Gaur, Deepika
AU  - Polavarapu, Lakshminarayana
AU  - Schwartzkopf, Matthias
AU  - Vayalil, Sarathlal Koyilot
AU  - Müller-Buschbaum, Peter
TI  - CsPbBr<sub>3</sub> Nanocrystals as Bottom Interface Nucleation Seeds for Printing Oriented FAPbI<sub>3</sub> Thin Films: An In Situ Study
JO  - Small
VL  - 21
IS  - 39
SN  - 1613-6810
CY  - Weinheim
PB  - Wiley-VCH
M1  - PUBDB-2025-04593
SP  - e05895
PY  - 2025
AB  - The exceptional optoelectronic properties of lead halide perovskites are highly sensitive to processing conditions, as uncontrolled crystallization driven by random nucleation often results in defect-rich active layers that impair device performance. Achieving controlled and oriented crystallization in printed films remains a major challenge. To address this, we introduce a pre-deposited CsPbBr3 nanocrystal seed layer at the bottom interface to guide crystallization and suppress defect formation. This strategy is evaluated via an in situ study on FAPbI3, offering mechanistic insights into the influence of seeding on film growth and optoelectronic quality. Using in situ grazing-incidence wide-angle X-ray scattering, transmission-mode UV–vis absorption, and photoluminescence spectroscopy, phase evolution and seed-mediated growth kinetics are tracked. Seeding accelerates the transition from the photoinactive δ-phase to the photoactive α-phase, yielding a crystallization rate constant over six times higher than in unseeded films. Moreover, the seed layer governs the crystallographic orientation of the resulting perovskite film, leading to improved optical absorption and reduced defect density.
LB  - PUB:(DE-HGF)16
C6  - pmid:40831314
DO  - DOI:10.1002/smll.202505895
UR  - https://bib-pubdb1.desy.de/record/639636
ER  -