Enhancing Efficiency and Stability of Perovskite Solar Cells via Photosensitive Molecule-Assisted Defect Passivation

Li, Mingguang; Peng, Ying; Pan, Wenjing; Wang, Zhizhi; Zong, Jiawei; Zhu, Zheng; Zhao, Lian; Gao, Huan; Chen, Runfeng

doi:10.1021/acsaem.2c03786

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…Figure b shows the Nyquist plots of different devices which are measured under AM1.5G illumination, and the fitted values of different samples are shown in Table S1. The semicircle in the high-frequency region represents the transfer resistance ( R ct ) of the device, and the transmission line in the low-frequency region represents the recombination impedance ( R rec ) of the device . The R ct value of the GQD/SnO 2 -based sample is 727, which is smaller than the R ct value of single SnO 2 of 811.…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Efficiency and Stability of Perovskite Solar Cells through Gradient Energy Band Tin Oxide Electron Transport Layer Design with Graphene Quantum Dot Incorporation

Li,

Chen,

Guo

et al. 2024

ACS Appl. Energy Mater.

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The incorporation of graphene quantum dots (GQDs) with efficient charge carrier transport capability into a tin oxide (SnO 2 ) solution and the utilization of their distinct mass properties for effective self-stratification are proposed as a method for enhancing the efficiency and stability of perovskite solar cells. By employing an antisolvent spin-coating technique, an SnO 2 electron transport layer (ETL) with a gradient energy band structure is prepared. Devices based on this gradient energy band ETL exhibit an efficiency of 22.3%, whereas the efficiency of devices with a single SnO 2 ETL, used as a reference, is only 19.8%. Moreover, for unencapsulated devices, an efficiency of 86% is retained after continuous testing for 1000 h at 40 °C by an AM 1.5 G lamp. Further investigation reveals that the introduction of GQDs not only forms a gradient energy band structure but also effectively passivates the defects in the SnO 2 layer itself, thus ameliorating the issues of charge carrier separation and recombination during the transport process. This work presents an approach to SnO 2 ETL design, not only applicable to perovskite solar cells but also offering inspiration for other optoelectronic devices.

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Section: Resultsmentioning

confidence: 99%

Enhancing the Efficiency and Stability of Perovskite Solar Cells through Gradient Energy Band Tin Oxide Electron Transport Layer Design with Graphene Quantum Dot Incorporation

Li,

Chen,

Guo

et al. 2024

ACS Appl. Energy Mater.

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Ethyl Thioglycolate Assisted Multifunctional Surface Modulation for Efficient and Stable Inverted Perovskite Solar Cells

Wang,

Song

et al. 2024

Adv Funct Materials

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As the core component of sandwich‐like perovskite solar cells (PSCs), the quality of perovskite layer is a challenge for further progress in PSCs due to the unfavorable defects and uncontrollable crystallization. Here, a surface post‐treatment strategy employing ethyl thioglycolate (ET) as ligand molecule is developed for property manipulation of perovskite films. ET can lower surface energy of perovskite facets and induces secondary growth of grains, giving films with higher crystallinity and lower defect density. Meanwhile, both carbonyl and sulfhydryl in ET can bind to the Pb2+, thus forming bidentate anchoring on the surface for defect passivation. Besides, the perovskite/ET/C60 interface presents improved charge transfer owing to the well‐aligned energy levels. Consequently, the power‐conversion‐efficiency (PCE) is boosted to 22.42% and 23.56% (certified 23.29%) for the FA0.85Cs0.15Pb(I0.95Br0.05)3 and FA0.9MA0.05Cs0.05Pb(I0.95Br0.05)3 PSCs, respectively, and the FA0.85Cs0.15Pb(I0.95Br0.05)3‐based PSC with a larger area (1.03 cm2) delivers a PCE of 20.01%. Importantly, ET demonstrates effective management of I2 and PbI2, thereby preventing accelerated degradation and lead leakage of devices. Thanks to the multiple effects of ET, the resulting devices exhibit significantly enhanced ambient stability over a course of 800 h, and a thermal stability of over 1500 h while maintaining 80.4% of its original efficiency.

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One‐Step Synthesis of Lead‐Free and Hole Transport Layer‐Free Methylammonium Bismuth Chloride ((CH₃NH₃)₃Bi₂I_xCl_9−x)‐Based Perovskite Solar Cells

Palanichamy,

Santhanam,

Natarajan

et al. 2024

Energy Tech

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The scientific community is moving toward a green environment using several nontoxic photon‐absorbing materials like tin, germanium, antimony, and bismuth. Bismuth halides have essential advantages like low toxicity, Earth abundance, good chemical stability, and optoelectronic behavior which make them suitable for lead‐free perovskite solar cells. Herein, a streamlined one‐step spin‐coating technique is employed using DMF to enhance the morphology of thin films based on BiCl3 perovskite. The resulting thin films of methylammonium bismuth halide ((CH3NH3)3Bi2IxCl9−x) display a remarkably uniform, pinhole‐free, and finely nanostructured morphology, ensuring consistent surface coverage. For the development of hole conductor‐free Bi‐perovskite solar cells (PSCs), carbon is utilized as both counter electrode and hole extraction layer. The device configuration entails FTO/Compact TiO2/meso‐TiO2/((CH3NH3)3Bi2IxCl9−x)/Carbon/FTO, a novel arrangement for Bi‐PSCs. Notably, the fabricated devices demonstrate commendable photovoltaic properties, including Voc of 280 mV, Jsc of 0.25 mA, fill factor of 0.60, and a notably elevated power conversion efficiency (PCE) of 0.042% which has proven significantly advantageous in achieving higher PCE. Furthermore, the fabricated devices exhibit robust chemical stability over 40 d when exposed to an ambient atmosphere without encapsulation. The solar cells retain 25% of their initial PCE after 168 h, further highlighting their durability and suitability for practical applications.

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Enhancing Efficiency and Stability of Perovskite Solar Cells via Photosensitive Molecule-Assisted Defect Passivation

Cited by 3 publications

References 35 publications

Enhancing the Efficiency and Stability of Perovskite Solar Cells through Gradient Energy Band Tin Oxide Electron Transport Layer Design with Graphene Quantum Dot Incorporation

Enhancing the Efficiency and Stability of Perovskite Solar Cells through Gradient Energy Band Tin Oxide Electron Transport Layer Design with Graphene Quantum Dot Incorporation

Ethyl Thioglycolate Assisted Multifunctional Surface Modulation for Efficient and Stable Inverted Perovskite Solar Cells

One‐Step Synthesis of Lead‐Free and Hole Transport Layer‐Free Methylammonium Bismuth Chloride ((CH₃NH₃)₃Bi₂I_xCl_9−x)‐Based Perovskite Solar Cells

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Enhancing Efficiency and Stability of Perovskite Solar Cells via Photosensitive Molecule-Assisted Defect Passivation

Cited by 3 publications

References 35 publications

Enhancing the Efficiency and Stability of Perovskite Solar Cells through Gradient Energy Band Tin Oxide Electron Transport Layer Design with Graphene Quantum Dot Incorporation

Enhancing the Efficiency and Stability of Perovskite Solar Cells through Gradient Energy Band Tin Oxide Electron Transport Layer Design with Graphene Quantum Dot Incorporation

Ethyl Thioglycolate Assisted Multifunctional Surface Modulation for Efficient and Stable Inverted Perovskite Solar Cells

One‐Step Synthesis of Lead‐Free and Hole Transport Layer‐Free Methylammonium Bismuth Chloride ((CH3NH3)3Bi2IxCl9−x)‐Based Perovskite Solar Cells

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One‐Step Synthesis of Lead‐Free and Hole Transport Layer‐Free Methylammonium Bismuth Chloride ((CH₃NH₃)₃Bi₂I_xCl_9−x)‐Based Perovskite Solar Cells