Low temperature excitonic spectroscopy and dynamics as a probe of quality in hybrid perovskite thin films. Issue 41 (29th July 2016)

• Record Type: Journal Article
• Authors: Sarang, Som; Ishihara, Hidetaka; Chen, Yen-Chang; Lin, Oliver; Gopinathan, Ajay; Tung, Vincent C.; Ghosh, Sayantani
• Is Part Of: Physical chemistry chemical physics. Volume 18:Issue 41(2016)
• Page Start: 28428
• Page End: 28433
• Publication Date: 2016-07-29
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c6cp02971j
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : The low temperature anomalous spectroscopic properties of hybrid perovskite thin films were analyzed and a theoretical formalism was developed to quantify perovskite film quality. Abstract : We have developed a framework for using temperature dependent static and dynamic photoluminescence (PL) of hybrid organic–inorganic perovskites (PVSKs) to characterize lattice defects in thin films, based on the presence of nanodomains at low temperature. Our high-stability PVSK films are fabricated using a novel continuous liquid interface propagation technique, and in the tetragonal phase ( T > 120 K), they exhibit bi-exponential recombination from free charge carriers with an average PL lifetime of ∼200 ns. Below 120 K, the emergence of the orthorhombic phase is accompanied by a reduction in lifetimes by an order of magnitude, which we establish to be the result of a crossover from free carrier to exciton-dominated radiative recombination. Analysis of the PL as a function of excitation power at different temperatures provides direct evidence that the exciton binding energy is different in the two phases, and using these results, we present a theoretical approach to estimate this variable binding energy. Our findings explain this anomalous low temperature behavior for the first time, attributing it to an inherent fundamental property of the hybrid PVSKs that can be used as an effective probe of thin film quality.