Origin of the high performance of perovskite solar cells with large grains

Chen, Jian; Shi, Tongfei; Li, Xinhua; Zhou, Baoxue; Cao, Huaxiang; Wang, Yuqi

doi:10.1063/1.4941238

Cited by 50 publications

(49 citation statements)

References 23 publications

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“…2 , respectively. In consistence with other works 1617 , the MAPbI 3 was a polycrystalline film composed of grains with size ~300 nm. From the Fig.…”

supporting

confidence: 80%

Ti/Au Cathode for Electronic transport material-free organic-inorganic hybrid perovskite solar cells

Shi

Chen

Zheng

et al. 2016

Sci Rep

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We have fabricated organic-inorganic hybrid perovskite solar cell that uses a Ti/Au multilayer as cathode and does not use electron transport materials, and achieved the highest power conversion efficiency close to 13% with high reproducibility and hysteresis-free photocurrent curves. Our cell has a Schottky planar heterojunction structure (ITO/PEDOT:PSS/perovskite/Ti/Au), in which the Ti insertion layer isolate the perovskite and Au layers, thus proving good contact between the Au and perovskite and increasing the cells’ shunt resistance greatly. Moreover, the Ti/Au cathode in direct contact with hybrid perovskite showed no reaction for a long-term exposure to the air, and can provide sufficient protection and avoid the perovskite and PEDOT:PSS layers contact with moisture. Hence, the Ti/Au based devices retain about 70% of their original efficiency after 300 h storage in the ambient environment.

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“…2 , respectively. In consistence with other works 1617 , the MAPbI 3 was a polycrystalline film composed of grains with size ~300 nm. From the Fig.…”

supporting

confidence: 80%

Ti/Au Cathode for Electronic transport material-free organic-inorganic hybrid perovskite solar cells

Shi

Chen

Zheng

et al. 2016

Sci Rep

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“…As clearly seen, the obtained morphological and electronic properties of the CH 3 NH 3 PbI 3 perovskite depend very much on the preparation technologies. Also the small grain boundaries and defects in polycrystalline sample hinder the overall device performance; a perovskite layer with large grains and pin‐hole free is highly desired for achieving high‐efficiency device …”

Section: Resultsmentioning

confidence: 99%

Surface Photovoltage Spectroscopy Study of Ultrasonically Sprayed‐Aerosol CH₃NH₃PbI₃ Perovskite Crystals

Henjongchom

Rujisamphan

Tang

et al. 2018

Physica Status Solidi (a)

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A simple deposition process for preparing crystalline semiconductors with low degrees of disorder is of paramount interest for both device applications and research investigations. This study centers on the ultrasonically sprayedaerosol based approach for preparing crystals of methylammonium lead trihalide perovskite (CH 3 NH 3 PbI 3 ). The surface photovoltage (SPV) spectra are found to depend strongly on the preparation conditions, with the SPV signals (below the material's band gap) providing information on the defect states. The measured values of tail states near the band gap (E t ) are found to be about 21 and 52 meV for the CH 3 NH 3 PbI 3 crystals prepared by the ultrasonically sprayed-on and spun casting approaches, respectively.

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“…Note that the double-peak feature persists over the phase transitions from the orthorhombic phase to tetragonal and cubic phases, and ΔE increases with temperature ( Figure S6, Supporting Information), which is unlikely the case for mechanism (6). To this end, two origins have been proposed to account for these features in lead halide perovskites: (I) recombination of randomly distributed donor-acceptor pair (DAP) with a recombination rate exponentially dependent on the DAP separation, [19,20,35] and (II) trap-assisted emission of carriers in the localized states induced by structural or compositional disorder at low temperature. A detailed lattice-electronic properties study to explicate the origins of the dual band band-edge PL peak and to establish a unified photophysical picture coherent across perovskite single crystals, polycrystalline thin films, and nanostructures is the focus of our other study.…”

Section: Fluence Dependence Of the Photoluminescencementioning

confidence: 99%

Localized Traps Limited Recombination in Lead Bromide Perovskites

Jamaludin

et al. 2019

Advanced Energy Materials

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Traps exert an omnipotent influence over the performance of halide perovskite optoelectronic devices. A clear understanding of the origin and nature of the traps in halide perovskites is the key to controlling them and realizing optimal devices. Herein, the role of localized traps on the optical properties of lead bromide perovskite films is investigated. In the low‐temperature orthorhombic phase of CH3NH3PbBr3 perovskite, band‐edge carrier dynamics exhibit a power‐law decay due to the presence of structural‐disorder‐induced localized traps, which has a depth of ≈40 meV. The continuous distribution of these localized traps gives rise to a broad sub‐band‐gap emission that becomes more prominent in thicker films with a larger trap density. The presence of this emission only from the hybrid organic–inorganic perovskites points to the vital role of organic dipoles in localized trap states formation. This study explicates the nature of these localized traps as well as their nontrivial role in carrier recombination kinetics, which is of fundamental importance in perovskites optoelectronics.

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Origin of the high performance of perovskite solar cells with large grains

Cited by 50 publications

References 23 publications

Ti/Au Cathode for Electronic transport material-free organic-inorganic hybrid perovskite solar cells

Ti/Au Cathode for Electronic transport material-free organic-inorganic hybrid perovskite solar cells

Surface Photovoltage Spectroscopy Study of Ultrasonically Sprayed‐Aerosol CH₃NH₃PbI₃ Perovskite Crystals

Localized Traps Limited Recombination in Lead Bromide Perovskites

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Origin of the high performance of perovskite solar cells with large grains

Cited by 50 publications

References 23 publications

Ti/Au Cathode for Electronic transport material-free organic-inorganic hybrid perovskite solar cells

Ti/Au Cathode for Electronic transport material-free organic-inorganic hybrid perovskite solar cells

Surface Photovoltage Spectroscopy Study of Ultrasonically Sprayed‐Aerosol CH3NH3PbI3 Perovskite Crystals

Localized Traps Limited Recombination in Lead Bromide Perovskites

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Surface Photovoltage Spectroscopy Study of Ultrasonically Sprayed‐Aerosol CH₃NH₃PbI₃ Perovskite Crystals