Domain-Size-Dependent Residual Stress Governs the Phase-Transition and Photoluminescence Behavior of Methylammonium Lead Iodide

Kwangjae Lee, Bekir Turedi, Andrea Giugni, Muhammad Naufal Lintangpradipto, Ayan A. Zhumekenov, Abdullah Alsalloum, Jung-Hong Min, Ibrahim Dursun, Rounak Naphade, Somak Mitra, Iman S. Roqan, Boon S. Ooi, Omar F. Mohammed, Enzo M. Di Fabrizio, Namchul Cho, Osman Bakr

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Methylammonium lead iodide (MAPbI3) perovskite has garnered significant interest as a versatile material for optoelectronic applications. The temperature-dependent photoluminescence (TDPL) and phase-transition behaviors revealed in previous studies have become standard indicators of defects, stability, charge carrier dynamics, and device performance. However, published reports abound with examples of irregular photoluminescence and phase-transition phenomena that are difficult to reconcile, posing major challenges in the correlation of those properties with the actual material state or with the subsequent device performance. In this paper, a unifying explanation for the seemingly inconsistent TDPL and phase-transition (orthorhombic-to-tetragonal) characteristics observed for MAPbI3 is presented. By investigating MAPbI3 perovskites with varying crystalline states, ranging from polycrystal to highly oriented crystal as well as single-crystals, key features in the TDPL and phase-transition behaviors are identified that are related to the extent of crystal domain-size-dependent residual stress and stem from the considerable volume difference (ΔV ≈ 4.5%) between the primitive unit cells of the orthorhombic (at 80 K) and tetragonal phases (at 300 K) of MAPbI3. This fundamental connection is essential for understanding the photophysics and material processing of soft perovskites.
Original languageEnglish (US)
Pages (from-to)2008088
JournalAdvanced Functional Materials
StatePublished - Feb 11 2021


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