Role of microstructure in the electron-hole interaction of hybrid lead halide perovskites
Giulia Grancini,Ajay Ram Srimath Kandada,Jarvist M. Frost,Alex J. Barker,Michele De Bastiani,Michele De Bastiani,Marina Gandini,Marina Gandini,Sergio Marras,Guglielmo Lanzani,Guglielmo Lanzani,Aron Walsh,Annamaria Petrozza +12 more
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TLDR
It is demonstrated, through a combination of optical spectroscopy and multiscale modeling as a function of the degree of polycrystallinity and temperature, that the electron-hole interaction is sensitive to the microstructure of the material.Abstract:
Solar cells based on hybrid inorganic-organic halide perovskites have demonstrated high power conversion efficiencies in a range of architectures. The existence and stability of bound electron-hole pairs in these materials, and their role in the exceptional performance of optoelectronic devices, remains a controversial issue. Here we demonstrate, through a combination of optical spectroscopy and multiscale modeling as a function of the degree of polycrystallinity and temperature, that the electron-hole interaction is sensitive to the microstructure of the material. The long-range order is disrupted by polycrystalline disorder and the variations in electrostatic potential found for smaller crystals suppress exciton formation, while larger crystals of the same composition demonstrate an unambiguous excitonic state. We conclude that fabrication procedures and morphology strongly influence perovskite behaviour, with both free carrier and excitonic regimes possible, with strong implications for optoelectronic devices.read more
Citations
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Intriguing Optoelectronic Properties of Metal Halide Perovskites
TL;DR: This review is a critical account of the interrelation between MHP electronic structure, absorption, emission, carrier dynamics and transport, and other relevant photophysical processes that have propelled these materials to the forefront of modern optoelectronics research.
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Understanding the physical properties of hybrid perovskites for photovoltaic applications
TL;DR: In this paper, a review summarizes advances in understanding the unique physical properties of hybrid perovskites that enable the fabrication of high-efficiency solar cells with high open-circuit voltages, which is crucial for their further development towards commercialization.
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Defects in perovskite-halides and their effects in solar cells
James M. Ball,Annamaria Petrozza +1 more
TL;DR: Petrozza and Ball as mentioned in this paper described the state of the art in the understanding of the origin and nature of defects in perovskite-halide light absorbers and their impact on carrier recombination, charge-transport, band alignment, and electrical instability.
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Charge-Carrier Dynamics in Organic-Inorganic Metal Halide Perovskites
TL;DR: An overview is presented of the numerous experimental approaches toward determining values for exciton binding energies, which appear to be small and depend significantly on temperature because of associated changes in the dielectric function.
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Dimensional tailoring of hybrid perovskites for photovoltaics
TL;DR: In this article, a review of the state of the art in 2D perovskites is provided, providing an overview of structural and materials engineering aspects and optical and photophysical properties.
References
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Long-Range Balanced Electron- and Hole-Transport Lengths in Organic-Inorganic CH3NH3PbI3
Guichuan Xing,Nripan Mathews,Shuangyong Sun,Swee Sien Lim,Yeng Ming Lam,Michael Grätzel,Michael Grätzel,Subodh Mhaisalkar,Tze Chien Sum +8 more
TL;DR: Two studies show, using a variety of time-resolved absorption and emission spectroscopic techniques, that perovskite materials manifest relatively long diffusion paths for charge carriers energized by light absorption, highlighting effective carrier diffusion as a fruitful parameter for further optimization.
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Interface engineering of highly efficient perovskite solar cells
Huanping Zhou,Qi Chen,Gang Li,Song Luo,Tze Bing Song,Hsin Sheng Duan,Ziruo Hong,Jingbi You,Yongsheng Liu,Yang Yang +9 more
TL;DR: Perovskite films received a boost in photovoltaic efficiency through controlled formation of charge-generating films and improved current transfer to the electrodes and low-temperature processing steps allowed the use of materials that draw current out of the perovskites layer more efficiently.
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Compositional engineering of perovskite materials for high-performance solar cells
Nam Joong Jeon,Jun Hong Noh,Woon Seok Yang,Young Chan Kim,Seungchan Ryu,Jangwon Seo,Sang Il Seok +6 more
TL;DR: This work combines the promising—but relatively unstable formamidinium lead iodide with FAPbI3 with methylammonium lead bromide as the light-harvesting unit in a bilayer solar-cell architecture and improves the power conversion efficiency of the solar cell to more than 18 per cent under a standard illumination.
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Temperature dependence of the energy gap in semiconductors
TL;DR: In this article, a relation for the variation of the energy gap (E g ) with temperature (T ) in semiconductors is proposed. And the equation satisfactorily represents the experimental data for diamond, Si, Ge, 6H-SiC, GaAs, InP and InAs.
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Electron-hole diffusion lengths > 175 μm in solution-grown CH3NH3PbI3 single crystals
TL;DR: It is found that the diffusion lengths in CH3NH3PbI3 single crystals grown by a solution-growth method can exceed 175 micrometers under 1 sun (100 mW cm−2) illumination and exceed 3 millimeters under weak light for both electrons and holes.