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 6 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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A Multisite Atomic‐Oxygen Anchoring Strategy Affords Efficient and Stable Perovskite Solar Cells

Li,

Pan,

Zhao

et al. 2024

Adv Funct Materials

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Lewis base molecules are widely used to passivate structural defects in perovskites. However, the spatial compatibility between these molecules and the perovskite lattice is seldom considered. Herein, a multisite atomic‐oxygen (O) anchoring passivation strategy using 1,1,2,2‐tetra(4‐methoxyphenyl)ethene (TMPE), which contains four electronegative O atoms to selectively anchor iodine vacancies and passivate under‐coordinated Pb2+ or MA+ defects is proposed. It is found that the distance between any three O atoms in a TMPE molecule matches that of iodine ions in the lattice structure, thereby maximizing passivation effects and enhancing lattice stability. Additionally, the coordination of TMPE facilitates the formation of larger colloid sizes in the precursor solution, effectively regulating crystal growth. Due to the molecular extrusion effect, TMPE‐based anchors localize on the surface, passivating defects and mitigating nonradiative recombination. As a result, defects in MA‐based and FA‐based perovskite films are significantly reduced, achieving optimized power conversion efficiencies (PCEs) of 19.9% and 24.5%, while exhibiting exceptional stability by retaining 90% of initial PCE after 1200 h of storage without encapsulation. This single molecule‐controlled perovskite multisite anchoring strategy would help resolve lattice stability issue caused by perovskite defects, thereby paving the pathway for the development of high‐performance and highly stable perovskite solar cells.

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

Cited by 6 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

A Multisite Atomic‐Oxygen Anchoring Strategy Affords Efficient and Stable Perovskite Solar Cells

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