Optical properties of PbI-based perovskite structures

Ishihara, Teruya

doi:10.1016/0022-2313(94)90145-7

Cited by 394 publications

(401 citation statements)

References 11 publications

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“…As the exciton binding (E b ) energy is expected to be on the order of but slightly larger than the thermal energy (E b B45 meV) (ref. 27), we expect a coexistence of excitons and free charge. At this stage, we do not know the branching ratio between free carriers and bound excitons, but this is an important factor to determine in order to understand the operating mechanism of these planarheterojunction solar cells.…”

Section: Discussionmentioning

confidence: 79%

Efficient organometal trihalide perovskite planar-heterojunction solar cells on flexible polymer substrates

et al. 2013

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Organometal trihalide perovskite solar cells offer the promise of a low-cost easily manufacturable solar technology, compatible with large-scale low-temperature solution processing. Within 1 year of development, solar-to-electric power-conversion efficiencies have risen to over 15%, and further imminent improvements are expected. Here we show that this technology can be successfully made compatible with electron acceptor and donor materials generally used in organic photovoltaics. We demonstrate that a single thin film of the lowtemperature solution-processed organometal trihalide perovskite absorber CH 3 NH 3 PbI 3-x Cl x , sandwiched between organic contacts can exhibit devices with power-conversion efficiency of up to 10% on glass substrates and over 6% on flexible polymer substrates. This work represents an important step forward, as it removes most barriers to adoption of the perovskite technology by the organic photovoltaic community, and can thus utilize the extensive existing knowledge of hybrid interfaces for further device improvements and flexible processing platforms.

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Section: Discussionmentioning

confidence: 79%

Efficient organometal trihalide perovskite planar-heterojunction solar cells on flexible polymer substrates

et al. 2013

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“…Frost et al estimated the binding energy of excitons in this system to be about 0.7 meV -too small to affect significantly the photovoltaic performance [16]. This is in contradiction with experimental evidences that indicate a value in the range 6-55 meV [5,37,[67][68][69][70][71][72]. Solutions of the Bethe-Salpeter equation for a single molecular orientation revealed huge exciton binding energies of 153 meV for the cubic phase [39] and 40 meV for the tetragonal phase [32].…”

Section: Discussionmentioning

confidence: 83%

Breathing bands due to molecular order in CH3NH3PbI3

Wierzbowska

Meléndez

Varsano

2018

Computational Materials Science

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CH 3 NH 3 PbI 3 perovskite is nowadays amongst the most promising photovoltaic materials for energy conversion. We have studied by ab-initio calculations, using several levels of approximation -namely density functional theory including spin-orbit coupling and quasi-particle corrections by means of the GW method, as well as pseudopotential self-interaction corrections-, the role of the methylammonium orientation on the electronic structure of this perovskite. We have considered many molecular arrangements within 2 × 2 × 2 supercells, showing that the relative orientation of the organic molecules is responsible for a huge band gap variation up to 2 eV. The band gap sizes are related to distortions of the PbI 3 cage, which are in turn due to electrostatic interactions between this inorganic frame and the molecules. The strong dependence of the band gap on the mutual molecular orientation is confirmed at all levels of approximations.Our results suggest then that the coupling between the molecular motion and the interactions of the molecules with the inorganic cage could help to explain the widening of the absorption spectrum of CH 3 NH 3 PbI 3 perovskite, consistent with the observed white spectrum.

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“…With an exciton binding energy of up to 50 meV 11 , and the excess energy generated by the electron beam, the generated charges in these devices are considered as free electrons and holes. These numbers were recently re-validated by reports from spectroscopic studies that have shown that also under photo-excitation, the vast majority of charges are free electrons and holes 12 .…”

Section: Resultsmentioning

confidence: 99%

Elucidating the charge carrier separation and working mechanism of CH3NH3PbI3−xClx perovskite solar cells

et al. 2014

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Developments in organic-inorganic lead halide-based perovskite solar cells have been meteoric over the last 2 years, with small-area efficiencies surpassing 15%. We address the fundamental issue of how these cells work by applying a scanning electron microscopy-based technique to cell cross-sections. By mapping the variation in efficiency of charge separation and collection in the cross-sections, we show the presence of two prime high efficiency locations, one at/near the absorber/hole-blocking-layer, and the second at/near the absorber/electron-blocking-layer interfaces, with the former more pronounced. This 'twin-peaks' profile is characteristic of a p-i-n solar cell, with a layer of low-doped, high electronic quality semiconductor, between a p-and an n-layer. If the electron blocker is replaced by a gold contact, only a heterojunction at the absorber/hole-blocking interface remains.

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Optical properties of PbI-based perovskite structures

Cited by 394 publications

References 11 publications

Efficient organometal trihalide perovskite planar-heterojunction solar cells on flexible polymer substrates

Efficient organometal trihalide perovskite planar-heterojunction solar cells on flexible polymer substrates

Breathing bands due to molecular order in CH3NH3PbI3

Elucidating the charge carrier separation and working mechanism of CH3NH3PbI3−xClx perovskite solar cells

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