Oxygen-induced defect-healing and photo-brightening of halide perovskite semiconductors: science and application

Huang, Like; Ge, Ziyi; Zhang, Xiaoli; Zhu, Yuejin

doi:10.1039/d0ta10946k

Cited by 24 publications

(17 citation statements)

References 88 publications

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“…The former group, using mesoporous TiO 2 as the electron-transporting material (ETM), obtained a then impressive power conversion efficiency (PCE) of 9.7%. Since these pioneering reports, numerous modifications have been introduced in order to get the best-performing, long-lasting PSCs. − To achieve these purposes, several strategies have involved the use of organic polymers …”

Section: Introductionmentioning

confidence: 99%

Organic Polymers as Additives in Perovskite Solar Cells

2021

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The wide field of polymer chemistry has recently encountered the unique, promising field of perovskite solar cells (PSCs). Thanks to their chemical versatility, the possible applications of organic polymers within solar devices have been highly diversified as charge-transporting materials, of either hole or electrons, or as additives, being these blended into the designed layer or used as a buffer layer. The use of different organic polymers as additives has demonstrated to be beneficial for the device performance and stability, thanks to an improved morphology of the thin layers and to their assistance in the charge transport. This perspective intends to provide the reader with a clear viewpoint on the role that polymers play as additives in PSCs. Thus, the most important examples describing the use of these macromolecules as additives in each of the possible target layers within PSCs are reported. Understanding the role played by the polymer together with the necessary chemical functionalities that provide each role within the solar cells is of primary importance in the future design of polymeric materials to be used in PSCs. Therefore, with this perspective article, we expect to contribute in the rational design of next-generation organic polymers suitable to surpass the current state of the art in PSCs.

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Section: Introductionmentioning

confidence: 99%

Organic Polymers as Additives in Perovskite Solar Cells

2021

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“…The calculated mobility suggests that carriers trapped in V Cu also contribute to the photocurrent, see Supporting Discussion 3 for further discussions. The shallowness of energy band introduced by V Cu facilitates easy transitions for trapped holes to be free carriers by entering the conduction band through processes of detrapping, , leading to the high hole density and mobility in γ-CuI nanosheets.…”

Section: Resultsmentioning

confidence: 99%

Defect-State Transition Associated Hole Dynamics in Cuprous Iodide Nanosheets

Zhang

Zhao

et al. 2022

J. Phys. Chem. C

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The cuprous iodide of zinc-blende structure (γ-CuI) is a p-type semiconductor with a wide band gap of 3.1 eV. It is considered promising as the third generation of semiconductors, in applications of hole transport layer and transparent electrode due to the high hole density and carrier mobility, but its carrier transport characteristics have not yet been understood in detail. We synthesized γ-CuI nanosheets with large sizes and measured the carrier dynamics by femtosecond transient absorption (TA) spectroscopy. We observed signals of defect trapping photogenerated carriers during band-edge transitions, as well the weak band filling and photoinduced absorption directly associated with defect states. The species and lifetimes of defect assisted transition are identified and quantified based on TA measurements with various excitation fluences, and the changes of spectra and kinetics of defect band filling are correlated to the trend of density of Cu and I vacancies in samples with different thicknesses, based on the observations on a single nanosheet. We extract a diffusion coefficient of ∼71 cm 2 s −1 and derive a diffusion length longer than the sample thickness, which possibly makes a remarkable contribution to the generation of a photocurrent. Our findings are expected to offer help for harnessing the defects in γ-CuI and improving its performances in optoelectronic applications.

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“…This increased non-radiative lifetime is a well-known phenomenon, resulting in an increase in the time-integrated PL and consequently in the photoluminescence quantum yield (QY). [42][43][44][45][46] The radiometric measurements demonstrates that the absolute radiance at t = 0 (PL 0 ), which is proportional to B ext , is actually not affected by photohealing, showing no evident correlation between the radiative recombination rate constant derived from eqn (1) and the characteristic time of the PL decay. To exclude possible ultrafast decays of the excited population, also femtosecond differential transmission measurements have been performed on the MAPB film kept in vacuum, as reported in Fig.…”

Section: Direct Measurement Of the Radiative Decay Ratesmentioning

confidence: 96%