Extraction technique of trap states based on transient photo-voltage measurement

Lin, Zedong

doi:10.1038/s41598-020-69914-y

Cited by 14 publications

(3 citation statements)

References 56 publications

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“…To our delight, such intragap states could be eliminated by the DSPC molecule (see the yellow line spectrum), demonstrating its effectiveness for passivating the trap states. Since such intragap states in a semiconductor always serve as non-radiative recombination centers, their reduction will decrease the pernicious non-radiative recombination and improve photovoltaic performance of devices [ 46 ]. On the other hand, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Long-Chain Gemini Surfactant-Assisted Blade Coating Enables Large-Area Carbon-Based Perovskite Solar Modules with Record Performance

et al. 2023

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Carbon-based perovskite solar cells show great potential owing to their low-cost production and superior stability in ambient air. However, scaling up to high-efficiency carbon-based solar modules hinges on reliable deposition of uniform defect-free perovskite films over large areas, which is an unsettled but urgent issue. In this work, a long-chain gemini surfactant is introduced into perovskite precursor ink to enforce self-assembly into a network structure, considerably enhancing the coverage and smoothness of the perovskite films. The long gemini surfactant plays a distinctively synergistic role in perovskite film construction, crystallization kinetics modulation and defect passivation, leading to a certified record power conversion efficiency of 15.46% with Voc of 1.13 V and Jsc of 22.92 mA cm−2 for this type of modules. Importantly, all of the functional layers of the module are printed through a simple and high-speed (300 cm min−1) blade coating strategy in ambient atmosphere. These results mark a significant step toward the commercialization of all-printable carbon-based perovskite solar modules.

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Section: Resultsmentioning

confidence: 99%

Long-Chain Gemini Surfactant-Assisted Blade Coating Enables Large-Area Carbon-Based Perovskite Solar Modules with Record Performance

et al. 2023

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“…Owing to the remarkable advantages in tunable band gap, high defect tolerance, long carrier diffusion length, strong light absorption ability, and high carrier mobility, − perovskite has emerged as a promising photoactive material for constructing high-performance narrowband photodetectors. ,, The continuous progresses of regulating the perovskite thickness and band gap as well as the distribution of trap state have given access to narrowband response with the desired response peaks and wavelengths. ,,, By manipulating the generation, transport, recombination, and collection behaviors of carriers arising from the broad-band absorption spectrum, a narrowband external quantum efficiency (EQE) response could be obtained at specific wavelengths. ,,, Such narrowband perovskite photodetectors can also be made to work under zero bias, that is, self-driven, thereby affording many more advantages such as design simplicity, operation convenience, and energy saving. Wang et al presented a filter-less and self-driven perovskite narrowband photodetector by regulating the perovskite thickness in combination with the bulk-defect engineering, achieving an ∼10% EQE value at about 800 nm .…”

Section: Introductionmentioning

confidence: 99%

De Novo Studies of Working Mechanisms for Self-Driven Narrowband Perovskite Photodetectors

Lin

Yang

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Self-driven narrowband perovskite photodetectors have recently attracted significant attention due to their simple preparation, high performance, and amenability for system integration. However, the origin of narrowband photoresponse and the related regulation mechanisms still remains elusive. To address these issues, we herein perform a systematic investigation by formulating an analytic model in conjunction with finite element simulation. The optical and electrical simulations have resulted in design principles for perovskite narrowband photodetectors in terms of the dependence of external quantum efficiency (EQE) on perovskite layer thickness, doping concentration, and band gap as well as trap state concentration. Careful investigations on the profiles of electric field, current, and optical absorption reveal the dependence of narrowband EQE on the direction of incident light and perovskite doping types: only p-type perovskite can yield the narrowband photoresponse for illumination from the hole transport layer (HTL) side. The simulation results demonstrated in this study shed new light on the mechanism of perovskite-based narrowband photodetectors and provide valuable guidance for their design.

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“…The density of trap states (DOS T ) distribution is one of the most important factors determining the power conversion efficiency (PCE) of perovskite solar cells (PSCs) [1][2][3][4][5][6] . It affects the carrier recombination and transport to hinder the enhancement of PCE [7][8][9][10] . Recent years, people focus on the study of trap passivation [1][2][3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

Extension of In-Gap Electronic-State Spectrum Extraction Technique Based on Transient Photo-Voltage Measurement

Lin¹

2021

Preprint

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This article puts forward a novel insight for extraction of trap state density (DOST) based on the transient photo-voltage (TPV) experimental data. Inspired by the method based on the Gauss distribution model, we introduce a universal general distribution model and present a general technique of DOST distribution from the experimental data of TPV measurement. The method based on the exponential (Gauss) distribution model is the one (two) order special case of our method. Compared to the method based on the exponential model (applicable only when the TPV result satisfies linear relation) and Gauss model (applicable only when the TPV result satisfies quadratic function relation), our work is effective for arbitrary TPV result.

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Extraction technique of trap states based on transient photo-voltage measurement

Abstract: According to the TPV result, the carrier lifetime is a function of photo-voltage 46-49. Therefore, we rewrite Eq. (15) as

Cited by 14 publications

References 56 publications

Long-Chain Gemini Surfactant-Assisted Blade Coating Enables Large-Area Carbon-Based Perovskite Solar Modules with Record Performance

Long-Chain Gemini Surfactant-Assisted Blade Coating Enables Large-Area Carbon-Based Perovskite Solar Modules with Record Performance

De Novo Studies of Working Mechanisms for Self-Driven Narrowband Perovskite Photodetectors

Extension of In-Gap Electronic-State Spectrum Extraction Technique Based on Transient Photo-Voltage Measurement

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