Temperature dependent optical characteristics of all-inorganic CsPbBr3 nanocrystals film

Local Morphology Effects on the Photoluminescence Properties of Thin CsPbBr3 Nanocrystal Films

“…In particular, the analysis of the PL spectra shift (typically toward blue) and the increase in their linewidth as the temperature increases allows the quantitative investigation of exciton-phonon coupling [24][25][26][27][28][29]. In a similar way, the decrease in PL intensity as the temperature increases is typically ascribed to the thermal dissociation exciton, and the quantitative analysis of temperature-induced PL quenching allows the quantification of the exciton binding energy [26][27][28]30,31].…”

“…Despite the apparent simplicity of the determination of the fundamental quantities of CsPbBr 3 NCs through the quantitative analysis of the temperature dependence of the PL spectra, a careful look at the values obtained in different experiments on nominally comparable samples discloses a complex scenario. In particular, even if it is usually claimed that the progressive increase in PL linewidth with the temperature is mainly related to the coupling of excitons with LO phonons, the reported values of the LO phonon energy are widely scattered in the range between 14.4 and 63.9 meV [26][27][28][29][30] and, most of the time, they are clearly inconsistent with the expected value of 20.5 meV [32]. Even more surprisingly, inconsistent values were also reported for the same sample in an analysis of the temperature-induced PL peak shift (55.6 meV) and the increase in linewidth (14.9 meV) [29].…”

“…In particular, even if it is usually claimed that the progressive increase in PL linewidth with the temperature is mainly related to the coupling of excitons with LO phonons, the reported values of the LO phonon energy are widely scattered in the range between 14.4 and 63.9 meV [26][27][28][29][30] and, most of the time, they are clearly inconsistent with the expected value of 20.5 meV [32]. Even more surprisingly, inconsistent values were also reported for the same sample in an analysis of the temperature-induced PL peak shift (55.6 meV) and the increase in linewidth (14.9 meV) [29]. In a similar way, the thermal activation of PL quenching is typically ascribed to the thermal dissociation of excitons, but the values obtained for the exciton binding energy are widely scattered in the range from 18.4 (even lower than the bulk CsPbBr 3 value of 40 meV [15]) to 388.2 meV [26][27][28][29][30]33].…”

Simple and effective deposition method for solar cell perovskite films using a sheet of paper

“…The more intense peak confirms iScience Article the improved electronic quality of the perovskite film with lower density of non-radiative traps when soaking the paper applicator in antisolvent (Zhang et al, 2015). Future experiments such as temperature dependent PL (Zhang et al, 2020b) and transmission electron microscopy could add further information on the inner structure of the sample. For more insight on the electronic structure of the perovskite films, we performed a self-consistent optoelectronic simulation (involving solution of the Poisson equation and drift-diffusion model with SCAPS) to estimate the density of defect states (taken as fitting parameter) of the perovskite films (see Figure S5 and Table S2).…”

Luminescence of CsPbBr3 microcrystals embedded in the KBr matrix

“…3,à), ÿêà çái-ãà¹òüñÿ ç òàêîþ ñàìîþ äëÿ ìîíîêðèñòàëà. Ñìóãà À ç ïiäâèùåííÿì òåìïåðàòóðè âèÿâëÿ¹ îñíîâíó òåíäåíöiþ äî çìiùåííÿ â áiê âèñîêèõ åíåð ié, i òàêó ïîâåäiíêó ìîaeíà ïîÿñíèòè ÿê ðåçóëüòàò òåìïåðàòóðíîãî ðîçøèðåííÿ ìàòðèöi [19]. Ïîâåäiíêà ñìóãè  ç ïiäâèùåííÿì òåìïåðàòóðè ïîíàä ∼ 120 Ê ¹ âiäìiííîþ ¨ï îëîaeåííÿ çìiùó¹òüñÿ â äiëÿíêó íèae÷èõ åíåð ié.…”