Photostable electron-transport-layer-free flexible graphene quantum dots/perovskite solar cells by employing bathocuproine interlayer

Most previous studies of perovskite core/shell structures have been based on ZnO/TiO2 nanowires (NWs), which are not suitable for high photoelectric conversion efficiency. Here, core/shell ZnO/TiO2 NWs with AgCl-doped CdSe quantum dots were fabricated as an electron transport layer (ETL) for perovskite solar cells, based on ZnO/TiO2 arrays. We designed CdSe with AgCl dopants that were synthesized by a colloidal process. An improvement of the recombination barrier (Rct1), due to shell supplementation with AgCl-doped CdSe quantum dots, improved the open circuit voltage, the fill factor, and the adsorption capacity of CH3NH3PbI3 perovskite with NWs. The enhanced cell steady state was attributable to TiO2 with AgCl-doped CdSe QD supplementation. A maximum power conversion efficiency of 15.12% was attained in an atmospheric environment. The mechanism of the recombination and electron transport in the perovskite solar cells becoming the basis of ZnO/TiO2 core/shell arrays was investigated to represent the merit of ZnO/TiO2 core/shell arrays as an electron transport layer in effective devices. These results showed an uncomplicated approach for restraining non-radiative recombination loss in hetero-structure core/shell arrays to significantly improve perovskite solar cell performance and increase the effectiveness of photovoltaics.

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Carbon Quantum Dots/TiOx Electron Transport Layer Boosts Efficiency of Planar Heterojunction Perovskite Solar Cells to 19%

Nano Letters ◽

10.1021/acs.nanolett.6b05177 ◽

2017 ◽

Vol 17 (4) ◽

pp. 2328-2335 ◽

Cited By ~ 117

Author(s):

Hao Li ◽

Weina Shi ◽

Wenchao Huang ◽

En-Ping Yao ◽

Junbo Han ◽

...

Keyword(s):

Quantum Dots ◽

Solar Cells ◽

Electron Transport ◽

Perovskite Solar Cells ◽

Carbon Quantum Dots ◽

Transport Layer ◽

Electron Transport Layer ◽

Planar Heterojunction

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Focussed Review of Utilization of Graphene-Based Materials in Electron Transport Layer in Halide Perovskite Solar Cells: Materials-Based Issues

Energies ◽

10.3390/en13236335 ◽

2020 ◽

Vol 13 (23) ◽

pp. 6335

Author(s):

Xinchen Dai ◽

Pramod Koshy ◽

Charles Christopher Sorrell ◽

Jongchul Lim ◽

Jae Sung Yun

Keyword(s):

Graphene Oxide ◽

Solar Cells ◽

Electron Transport ◽

Focal Point ◽

Graphene Quantum Dots ◽

Perovskite Solar Cells ◽

Transport Layer ◽

Fullerene Derivative ◽

Electron Transport Layer ◽

Halide Perovskite

The present work applies a focal point of materials-related issues to review the major case studies of electron transport layers (ETLs) of metal halide perovskite solar cells (PSCs) that contain graphene-based materials (GBMs), including graphene (GR), graphene oxide (GO), reduced graphene oxide (RGO), and graphene quantum dots (GQDs). The coverage includes the principal components of ETLs, which are compact and mesoporous TiO2, SnO2, ZnO and the fullerene derivative PCBM. Basic considerations of solar cell design are provided and the effects of the different ETL materials on the power conversion efficiency (PCE) have been surveyed. The strategy of adding GBMs is based on a range of phenomenological outcomes, including enhanced electron transport, enhanced current density-voltage (J-V) characteristics and parameters, potential for band gap (Eg) tuning, and enhanced device stability (chemical and environmental). These characteristics are made complicated by the variable effects of GBM size, amount, morphology, and distribution on the nanostructure, the resultant performance, and the associated effects on the potential for charge recombination. A further complication is the uncertain nature of the interfaces between the ETL and perovskite as well as between phases within the ETL.

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Enhancing Performances of Perovskite Solar Cells by Using Zinc Oxide Quantum Dots/Mesoporous Titania Electron Transport Layer

10.21203/rs.3.rs-607253/v1 ◽

2021 ◽

Author(s):

Mei Wang ◽

Huating Bo ◽

Qiuyun Fu ◽

Xinguo Ma ◽

Zhengwang Cheng ◽

...

Keyword(s):

Quantum Dots ◽

Solar Cells ◽

Electron Transport ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Photovoltaic Performance ◽

Perovskite Solar Cells ◽

Transport Layer ◽

Electron Transport Layer

Abstract As the photovoltaic performance of mesoscopic perovskite solar cells (PSCs) is strongly dependent on the interface between perovskite and electron transport layer. Herein, an attempt to load facile processed ZnO quantum dots (ZQDs) or TiO2 quantum dots (TQDs) into the mp-TiO2 layer via a simple spin-coating method was first performed. Both of them had huge impact on the morphology of perovskite films, leading to larger perovskite grains. However, the power conversion efficiency (PCE) of these two kinds of QDs modified cells exhibited a different tendency. The champion PCE of ZQDs modified PSCs was remarkably improved from 14.54% to 17.2%, while that of TQDs modified ones decreased to 11.78%. We demonstrated that the enhanced PCE and short-circuit current (Jsc) were attributed to the enlarged grain size and enhanced light absorption of perovskite film, faster electron extraction and transport as well as less recombination for ZQDs modified PSCs, which mainly resulted from the increased active specific surface area. On the contrary, deterioration of TQDs modified PSCs was exactly ascribed to the aggregation of TQDs which sharply decreased the specific surface area of the electron transport layer. The current work provided an efficient and facile way to improve the photovoltaic performance of mesoscopic PSCs.

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Ultrathin and compact electron transport layer made from novel water-dispersed Fe3O4 nanoparticles to accomplish UV-stable perovskite solar cells

Materials Advances ◽

10.1039/d0ma01027h ◽

2021 ◽

Author(s):

Song Fang ◽

Bo Chen ◽

Bangkai Gu ◽

Linxing Meng ◽

Hao Lu ◽

...

Keyword(s):

Solar Cells ◽

Solar Cell ◽

Electron Transport ◽

Perovskite Solar Cells ◽

Perovskite Solar Cell ◽

Transport Layer ◽

Electron Transport Layer ◽

Perovskite Material ◽

Main Factors ◽

Induced Decomposition

UV induced decomposition of perovskite material is one of main factors to severely destroy perovskite solar cells for instability. Here we report a UV stable perovskite solar cell with a...

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