Control of Charge Transport in the Perovskite CH3NH3PbI3 Thin Film

Shi, Jiangjian; Wei, Huiyun; Lv, Songtao; Xu, Xin; Wu, Haiming; Luo, Yanhong; Li, Dongmei; Meng, Qingbo

doi:10.1002/cphc.201402815

Cited by 38 publications

(22 citation statements)

References 37 publications

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“…To further examine the effects of crystal facet orientation on the carrier dynamics within the device, we have conducted transient photovoltage (TPV) and transient photocurrent (TPC) measurements on the cells. In TPV measurements, devices are excited by a short laser pulse to receive a TPV response, which are widely employed to probe the electron lifetime related to recombination rates in the perovskites solar cells 13 , 56 , 57 . We compared three devices based on the absorbers of (FAMA) (100− x ) Cs x mixed perovskites with different orientation preference, whereas Cs contents are 0, 5, and 10%, respectively.…”

Section: Resultsmentioning

confidence: 99%

Manipulation of facet orientation in hybrid perovskite polycrystalline films by cation cascade

et al. 2018

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Crystal orientations in multiple orders correlate to the properties of polycrystalline materials, and it is critical to manipulate these microstructural arrangements to enhance device performance. Herein, we report a controllable approach to manipulate the facet orientation within the ABX3 hybrid perovskites polycrystalline films by cation cascade doping at A-site. Two-dimensional synchrotron radiation grazing incidence wide-angle X-ray scattering is employed to probe the crystal orientations in multiple orders in mixed perovskites thin films, revealing a general pattern to guide crystal planes stacking upon extrinsic doping during crystallization. Different from previous studies, this method enables to adjust the crystal stacking mode of certain crystallographic planes in polycrystalline perovskites. Moreover, the preferred facet orientation is found to facilitate photocarrier transport across the absorber and pertaining interface in the resultant PV device, which provides an exemplary paradigm for further explorations that relate to the microstructures of hybrid perovskite materials and relevant optoelectronics.

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Section: Resultsmentioning

confidence: 99%

Manipulation of facet orientation in hybrid perovskite polycrystalline films by cation cascade

et al. 2018

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“…With increasing amounts of HAc in the precursor solution, the PL peak intensity of the obtained perovskite films decreases gradually. Considering the fact that the perovskite films are continual and have almost full surface coverage on the substrates, the reduced PL peak intensity can be attributed to a faster electron extraction from the perovskite films to the compact TiO 2 layers44. More efficient carrier transport achieved by the faster electron extraction maybe a contribution to the enhancement in the photovoltaic efficiency45.…”

Section: Resultsmentioning

confidence: 99%

Improving the photovoltaic performance of perovskite solar cells with acetate

Zhao

Song

et al. 2016

Sci Rep

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In an all-solid-state perovskite solar cell, methylammonium lead halide film is in charge of generating photo-excited electrons, thus its quality can directly influence the final photovoltaic performance of the solar cell. This paper accentuates a very simple chemical approach to improving the quality of a perovskite film with a suitable amount of acetic acid. With introduction of acetate ions, a homogeneous, continual and hole-free perovskite film comprised of high-crystallinity grains is obtained. UV-visible spectra, steady-state and time-resolved photoluminescence (PL) spectra reveal that the obtained perovskite film under the optimized conditions shows a higher light absorption, more efficient electron transport, and faster electron extraction to the adjoining electron transport layer. The features result in the optimized perovskite film can provide an improved short-circuit current. The corresponding solar cells with a planar configuration achieves an improved power conversion efficiency of 13.80%, and the highest power conversion efficiency in the photovoltaic measurements is up to 14.71%. The results not only provide a simple approach to optimizing perovskite films but also present a novel angle of view on fabricating high-performance perovskite solar cells.

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“…In the model described here p-type doping is involved, which has been demonstrated by some experimental works. 76,77 Free holes are composed of photoinduced holes (p) and doping holes (N A ) while only photoinduced electrons (n) exist. The free electrons in the CBM can radiatively recombine with the free holes with a kinetic constant B, or nonradiatively recombine through deep traps (N t ) with a charge-capture coefficient A.…”

Section: Carrier Recombination and Transport In The Bulk Absorbermentioning

confidence: 99%

From Ultrafast to Ultraslow: Charge-Carrier Dynamics of Perovskite Solar Cells

Shi

et al. 2018

Joule

Self Cite

217

184

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Despite the rapid development in the past years, performances of the perovskite solar cell are still limited by the photovoltage and fill factor that are mainly determined by the charge-carrier dynamics. In this review, the charge-carrier dynamics of the cell in a wide time span are summarized and discussed to provide a comprehensive understanding of the optoelectronic processes of the perovskite material and devices. Generally, free carriers are generated rapidly and dominate the following transport and recombination processes that mainly occur within a microsecond time scale. The relatively slow defect and ion dynamics and their characteristic time have also been presented. A physics stability regarding this cell is proposed based on understanding the ion dynamics, and the significance of regulating ion and electron dynamics is highlighted. We finally emphasize that elucidation of the band-edge energy structure and charge nature of the perovskite is still an open question.

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Control of Charge Transport in the Perovskite CH₃NH₃PbI₃ Thin Film

Cited by 38 publications

References 37 publications

Manipulation of facet orientation in hybrid perovskite polycrystalline films by cation cascade

Manipulation of facet orientation in hybrid perovskite polycrystalline films by cation cascade

Improving the photovoltaic performance of perovskite solar cells with acetate

From Ultrafast to Ultraslow: Charge-Carrier Dynamics of Perovskite Solar Cells

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