Towards understanding the initial performance improvement of PbS quantum dot solar cells upon short-term air exposure

Gao, Wenhui; Zhai, Guangmei; Zhang, Caifeng; Shao, Zhimeng; Zheng, Lulu; Zhang, Yong; Yang, Yongzhen; Li, Xuemin; Liu, Xuguang; Xu, Bingshe

doi:10.1039/c8ra01422a

Cited by 26 publications

(18 citation statements)

References 38 publications

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“…The resistances and ideality factors of the devices were obtained from these curves. The ideality factors are in the range of 3.5 ± 0.3, which is typical for the devices of this type [25][26][27]. The ideality factors and other device parameters are given in Table 2.…”

Section: Resultsmentioning

confidence: 93%

Functionalized rGO Interlayers Improve the Fill Factor and Current Density in PbS QDs-Based Solar Cells

et al. 2019

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Graphene-quantum dot nanocomposites attract significant attention for novel optoelectronic devices, such as ultrafast photodetectors and third-generation solar cells. Combining the remarkable optical properties of quantum dots (QDs) with the exceptional electrical properties of graphene derivatives opens a vast perspective for further growth in solar cell efficiency. Here, we applied (3-mercaptopropyl) trimethoxysilane functionalized reduced graphene oxide (f-rGO) to improve the QDs-based solar cell active layer. The different strategies of f-rGO embedding are explored. When f-rGO interlayers are inserted between PbS QD layers, the solar cells demonstrate a higher current density and a better fill factor. A combined study of the morphological and electrical parameters of the solar cells shows that the improved efficiency is associated with better layer homogeneity, lower trap-state densities, higher charge carrier concentrations, and the blocking of the minor charge carriers.

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Section: Resultsmentioning

confidence: 93%

Functionalized rGO Interlayers Improve the Fill Factor and Current Density in PbS QDs-Based Solar Cells

et al. 2019

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“…In PbS‐EDT layer, EDT is a p‐doped material, and PbS‐EDT generally suffers from low mobility due to a large number of trap states and poorer passivation as compared to PbS TBAI. [ 54 ] Furthermore, EDT is the shortest with only two carbon backbone and is predictably the most commonly used ligand for HTL to increase the conductivity. However, dithiol ligand has an inherent problem of forming long‐chain dimers when exposed to air that reduces mobility as reported by Lynch et al [ 55 ] The considered mobility value of 2 × 10 −4 and 2 × 10 −2 cm 2 V −1 s −1 for PbS‐EDT and PbS‐TBAI is in accordance with as reported by Zhang et al [ 47 ] in their supplementary file.…”

Section: Device Structure and Simulation Methodologymentioning

confidence: 99%

Design and Simulation of a‐Si:H/PbS Colloidal Quantum Dots Monolithic Tandem Solar Cell for 12% Efficiency

Kashyap

Pandey

Madan

et al. 2020

Physica Status Solidi (a)

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Tandem solar cells (TSC) is the most promising photovoltaic technology, as it efficiently overcomes the thermalization and nonabsorption losses. In this context, thin-film/colloidal quantum dot (CQD)-based 2-terminal monolithic TSCs are designed using a-Si:H of wide bandgap (1.7 eV) as the top cell and PbS CQD of narrow bandgap (1.2 eV) as the bottom cell. Initially, top and bottom subcells are designed and calibrated to have state-of-the-art power conversion efficiencies (PCE) of 6.86% and 9.38%, respectively. Afterward, the thicknesses of the inverted bottom cell are optimized as 200 nm so as to obtain 8.34% efficiency. The standalone condition reflects current density (J SC)/open-circuit voltage (V OC) of 9.97 mA cm À2 and 0.91 V in the top cell and 21.28 mA cm À2 / 0.63 V in the bottom cell. Further, both subcells are evaluated for tandem configuration with ITO-based interlayer to provide the current matching conditions. In the proposed tandem design, the thickness of the absorber layers is optimized to achieve the highest J SC , which is indeed limited by the top cell, due to a lower J SC value of 10.61 mA cm À2 in standalone conditions. Optimized tandem design with 200 nm/150 nm-thick absorber layer-based top/bottom subcell results in

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“…В целом работа подтверждает выводы других исследователей, что слой НК PbS−EDT является слабым местом солнечных элементов рассматриваемой структуры [3]. По этой причине замену лигандов EDT желательно проводить в растворе, а не после нанесения [29].…”

Section: обсуждение результатовunclassified

“…Хотя исследования таких устройств проводятся при изготовлении в инертной атмосфере и последующей эксплуатации в инкапсулированном виде, ряд исследований показывают достаточно высокую эффективность подобных устройств и при функционировании в условиях окружающей атмосферы. Установлено, что пребывание на воздухе в течение нескольких дней ведет к улучшению параметров СЭ [3].…”

Section: Introductionunclassified

Исследование Подвижности Носителей Заряда В Слоях Нанокристаллов PBS Методом Полевого Транзистора

Parfenov¹,

Бухряков²,

Онищук³

et al. 2022

Физика И Техника Полупроводников

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The field-effect transistor method is used to study the mobility of charge carriers in layers of lead sulfide nanocrystals with ligands of tetrabutylammonium iodide and 1,2-ethanedithiol used to create solar cells. The difference between the operating of a transistor in ambient air and in an inert atmosphere is demonstrated. It is shown that, in the ambient air, the processes of charging nanocrystals are activated when current flows, and the influence of the polarization of the interface of nanocrystals and the insulator on the measurement of the mobility is analyzed. Different reactions of the layers with ligands to light have been demonstrated, showing a significant oxidation of the surface of nanocrystals treated with 1,2-ethanedithiol.

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Towards understanding the initial performance improvement of PbS quantum dot solar cells upon short-term air exposure

Abstract: The mechanism at play that underpins the effect of short-term air exposure on the initial performance improvement of quantum dot solar cells is investigated.

Cited by 26 publications

References 38 publications

Functionalized rGO Interlayers Improve the Fill Factor and Current Density in PbS QDs-Based Solar Cells

Functionalized rGO Interlayers Improve the Fill Factor and Current Density in PbS QDs-Based Solar Cells

Design and Simulation of a‐Si:H/PbS Colloidal Quantum Dots Monolithic Tandem Solar Cell for 12% Efficiency

Исследование Подвижности Носителей Заряда В Слоях Нанокристаллов PBS Методом Полевого Транзистора

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