2016
DOI: 10.1002/adfm.201604995
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Abstract: Despite their outstanding photovoltaic performance, organic–inorganic perovskite solar cells still face severe stability issues and limitations in their device dimension. Further development of perovskite solar cells therefore requires a deeper understanding of loss mechanisms, in particular, concerning the origin and impact of trap states. Here, different surface properties of submicrometer sized CH3NH3PbI3 particles are studied as a model system by photoluminescence spectroscopy to investigate the impact of … Show more

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Cited by 24 publications
(22 citation statements)
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“…Given the morphology of the perovskites crystals, the origin of the non-radiative states acting as a sink for the radiative states can be ascribed to the NCs surface and their role is expected to be more relevant for smaller dots, since the ratio between the volume and the surface density of states scales with the dot size. As reported in CQDs [12], surface states can efficiently trap electrons and holes and therefore CQD surface is typically passivated to control the trap states [13,25]. To take into account the transfer of population from the surface states back to the radiative states, we model the dependence of the pedestal P on the temperature T, according to the following equation:…”
Section: Resultsmentioning
confidence: 99%
“…Given the morphology of the perovskites crystals, the origin of the non-radiative states acting as a sink for the radiative states can be ascribed to the NCs surface and their role is expected to be more relevant for smaller dots, since the ratio between the volume and the surface density of states scales with the dot size. As reported in CQDs [12], surface states can efficiently trap electrons and holes and therefore CQD surface is typically passivated to control the trap states [13,25]. To take into account the transfer of population from the surface states back to the radiative states, we model the dependence of the pedestal P on the temperature T, according to the following equation:…”
Section: Resultsmentioning
confidence: 99%
“…These approaches have been mainly oriented towards the passivation of traps present at the surface and grain boundaries of perovskite crystals, expected to introduce non-radiative recombination paths, by performing surface treatments. 21,22,23,24,25,26,27,28,29,30,31 In this work we propose a post-fabrication treatment intended to both improve the photoemission intensity throughout the entire volume of CH 3 NH 3 PbBr 3 micron sized single crystals and study the nature of trap states, related to the halide component of the perovskite matrix. This represents the first approach aiming at reducing the density of deep-trap states within the material volume and not only those related with surface traps.…”
Section: Introductionmentioning
confidence: 99%
“…[38,40] Furthermore, the free-exciton peak and the lower energy band shows different sensitivities to surface treatments. For example, the presence of a PMMA interface, [41] or substitution of MAPbI 3 particles with thiophenes [42] alter the relative contributions of the two features. This was also observed when investigating the low-temperature PL spectra for different perovskite microplates with various thicknesses.…”
Section: Photoluminescencementioning
confidence: 99%