Constructing CdS-Based Electron Transporting Layers With Efficient Electron Extraction for Perovskite Solar Cells

Luo, Cheng; Jiang, Ping; Hu, Liusen; Bian, Moran; Wan, Lei; Niu, Haihong; Mao, Xinyu; Zhou, Ru; Xu, Jun

doi:10.1109/jphotov.2021.3077445

Cited by 6 publications

(7 citation statements)

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“…Figure c shows the optical absorption spectra of perovskite films deposited on different ETLs, revealing that all of samples exhibited almost the identical absorption film thickness. The band gap of direct band gap semiconductor materials can be estimated according to eq where A is the absorption coefficient, h is the Planck constant, υ is the frequency of the incident photon, and c is a constant. , It can be calculated from the Tauc plots (Figure d) that the band gap E g of the MAPbI 3 semiconductor film is about 1.61 eV, which is in agreement with the reported values …”

Section: Results and Discussionmentioning

confidence: 99%

“…We performed EIS measurements for PSCs under dark conditions at the bias voltage of 1.0 V. Figure d presents the Nyquist plots of impedance spectra, and Table S3 summarizes the fitting results by using Z-view software. The high-frequency region generally represents the internal resistance ( R s ), and the low-frequency region represents the recombination resistance ( R rec ) at the interface; CPE is generally denoted as the constant phase element. , The R s of m-TiO 2 /SnO 2 -based devices (18.83 Ω) is comparable to that of SnO 2 -based devices (17.83 Ω) and slightly smaller than those of m-TiO 2 -based devices (20.87 Ω), while the R rec of m-TiO 2 /SnO 2 -based devices (2.87 × 10 4 Ω) is greater than those of SnO 2 -based (2.40 × 10 4 Ω) and m-TiO 2 -based devices (2.72 × 10 4 Ω). The measurement results of EIS further confirm that the modification of SnO 2 QDs can enhance the charge transfer at the m-TiO 2 /perovskite interface and inhibit the recombination of carriers.…”

Section: Results and Discussionmentioning

confidence: 99%

“…35,36 It can be calculated from the Tauc plots (Figure 5d) that the band gap E g of the MAPbI 3 semiconductor film is about 1.61 eV, which is in agreement with the reported values. 37 Figure 6a−c reveals that the perovskite films deposited onto different ETLs are highly dense, uniform, pinhole-free, and composed of distinguishable crystal grains. Moreover, as reflected by the statistical results of the inserted histogram, the m-TiO 2 -and m-TiO 2 /SnO 2 -based perovskite materials show relatively larger average crystal size than those of SnO 2based samples.…”

Section: Resultsmentioning

confidence: 99%

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SnO₂ Quantum Dot-Modified Mesoporous TiO₂ Electron Transport Layer for Efficient and Stable Perovskite Solar Cells

Zhou

Lyu

Zhu

et al. 2022

ACS Appl. Energy Mater.

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As a revolutionary photovoltaic technology, the perovskite solar cell has received enormous attention, owing to excellent electronic and optical properties of perovskite materials. The mesoporous TiO2 (m-TiO2) framework is extensively used as an electron transport layer (ETL) to construct high-performance perovskite solar cells (PSCs), showing efficient electron extraction capability, owing to the enlarged perovskite/ETL interface. However, the TiO2 ETL usually involves high-density oxygen vacancies, low electron mobility, and relatively high photocatalytic activity toward perovskite materials. To address such issues, herein, we demonstrate the successful construction of SnO2 quantum dot (QD)-modified m-TiO2 as an effective ETL for PSCs. It is revealed that the SnO2 QD-modified m-TiO2 ETL affords more favorable electron extraction and transport characteristics and suppressed charge recombination, resulting from the interfacial passivation and the enhanced conductivity of ETLs. Furthermore, the ultrathin SnO2 QD layer incorporated at the m-TiO2/perovskite interface effectively lowers the photocatalytic activity of TiO2 toward perovskite materials, thereby improving the long-term device stability. Eventually, the MAPbI3- and FAPbI3-based PSCs utilizing the SnO2 QD-modified m-TiO2 ETLs obtained appreciable power conversion efficiencies of 19.09 and 20.09%, respectively, higher than those of counterpart devices based on the conventional m-TiO2 and SnO2 ETLs.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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SnO₂ Quantum Dot-Modified Mesoporous TiO₂ Electron Transport Layer for Efficient and Stable Perovskite Solar Cells

Zhou

Lyu

Zhu

et al. 2022

ACS Appl. Energy Mater.

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“…improve the device performance of PSCs and found that the presence of the c-TiO 2 underlayer avoids the partial exposure of substrate bumps, enlarges the subsequently deposited perovskite crystals, forms cascade energy level alignments, and accelerates the electron extraction from perovskite to ETLs. [264] SnO 2 : SnO 2 appears as an alternative to the traditional TiO 2 . High electron mobility, deep CB, right energy level, lower crystallization temperature, and good chemical stability are some properties that made SnO 2 a perfect ETL for planar n-i-p PSCs.…”

Section: The Role Of Etl In the Performance Of Planar N-i-p Structure...mentioning

confidence: 99%

“…They designed bilayer TiO 2 /CdS ETLs to improve the device performance of PSCs and found that the presence of the c‐TiO 2 underlayer avoids the partial exposure of substrate bumps, enlarges the subsequently deposited perovskite crystals, forms cascade energy level alignments, and accelerates the electron extraction from perovskite to ETLs. [ 264 ]…”

Section: Common Solar Cell Structures and Their Effect On Performancementioning

confidence: 99%

Configuration of Methylammonium Lead Iodide Perovskite Solar Cell and its Effect on the Device's Performance: A Review

Dahal

2022

Adv Materials Inter

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Since it is a source of clean energy, harnessing solar power is a natural solution to resolving the prevalent energy crisis. A solar cell is the most effective device to convert solar energy into electricity. Hence, a study on solar cells is the utmost area of interest in the energy sector.As illustrated in Figure 1, there are three generations of solar cells. Among these, the first-generation cells were of p-n homojunction on a silicon crystal, where the thickness of the absorbing layer was more than 180 µm. Mainly, silicon (Si) and germanium (Ge), indirect bandgap materials, assemble the cell. Single crystal silicon solar cells exhibit a conversion efficiency of about 26.7% and dominate the current solar cell market. [2] The second-generation solar cells are heterojunction solar cells using direct bandgap thin film materials (CdS, CIGS, etc.). The demerits of the first and second-generation solar cells are the cost of semiconducting materials, limited availability, and toxicity to human health. Emerging thirdgeneration solar cells act as an alternative. These include dyesensitized solar cells (DSSCs), organic photovoltaics, quantum dots, and perovskite solar cells (PSCs). Among all those, PSCs are at the center of the emerging photovoltaic technology with rapid improvement in the performance within a few years of discovering the first perovskite cell. Figure 2 depicts the different types of solar cells and their developmental trend for the past 46 years, showing that the performance of the PSCs has improved dramatically during a short period.The foundation technology for PSCs is DSSCs. In 1991, O'Regan and Grätzel developed a low-cost photochemical solar cell based on a high surface area nanocrystalline TiO 2 film sensitized with dye molecule. [4] The primary concern of DSSCs is the use of liquid electrolytes, which regenerate the dye after it injects electrons into the conduction band (CB) of the working electrodes (anode), which are mainly the thin layer of the metal oxide semiconductor. The electrolyte also acts as a hole transporting material to the counter electrodes (cathode). [5] The solid-state hole conductor emerged as a replacement to minimize leakage concerns in liquid electrolyte-based DSSCs. With several modifications in the device structures, researchers are trying to synthesize efficient DSSCs. However, the low absorption coefficientIn its initial phase in 2009, the inorganic-organic hybrid perovskite solar cells (PSCs) delivered a 3.8% power conversion efficiency (PCE), which is far below the present 25.7% PCE obtained in 2022. The significant improvement of the efficiency of PSCs in such a short period has stimulated significant interest in the photovoltaic community. However, the performance of current PSCs is behind the commercially available and widely used solar cells in terms of stability and scalability. Among various commonly studied perovskite materials, methylammonium lead iodide (MAPbI 3 ) is the most widely studied. This review will focus on the common solar cell structures (mesoporo...

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Passivating defects in SnO2 electron transport layer through SnF2 incorporation in perovskite solar cells

Chen,

Hu,

Jisi

et al. 2024

Materials Today Communications

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Constructing CdS-Based Electron Transporting Layers With Efficient Electron Extraction for Perovskite Solar Cells

Cited by 6 publications

References 48 publications

SnO₂ Quantum Dot-Modified Mesoporous TiO₂ Electron Transport Layer for Efficient and Stable Perovskite Solar Cells

SnO₂ Quantum Dot-Modified Mesoporous TiO₂ Electron Transport Layer for Efficient and Stable Perovskite Solar Cells

Configuration of Methylammonium Lead Iodide Perovskite Solar Cell and its Effect on the Device's Performance: A Review

Passivating defects in SnO2 electron transport layer through SnF2 incorporation in perovskite solar cells

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Constructing CdS-Based Electron Transporting Layers With Efficient Electron Extraction for Perovskite Solar Cells

Cited by 6 publications

References 48 publications

SnO2 Quantum Dot-Modified Mesoporous TiO2 Electron Transport Layer for Efficient and Stable Perovskite Solar Cells

SnO2 Quantum Dot-Modified Mesoporous TiO2 Electron Transport Layer for Efficient and Stable Perovskite Solar Cells

Configuration of Methylammonium Lead Iodide Perovskite Solar Cell and its Effect on the Device's Performance: A Review

Passivating defects in SnO2 electron transport layer through SnF2 incorporation in perovskite solar cells

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Product

Resources

About

SnO₂ Quantum Dot-Modified Mesoporous TiO₂ Electron Transport Layer for Efficient and Stable Perovskite Solar Cells

SnO₂ Quantum Dot-Modified Mesoporous TiO₂ Electron Transport Layer for Efficient and Stable Perovskite Solar Cells