Improving Efficiency and Stability of Perovskite Solar Cells Enabled by A Near-Infrared-Absorbing Moisture Barrier

Hu, Qin; Chen, Wei; Yang, Wenqiang; Liu, Yu; Zhou, Yecheng; Larson, Bryon W.; Johnson, Justin C.; Lu, Ya‐Wen; Zhong, Wenkai; Xu, Jinqiu; Klivansky, Liana M.; Wang, Cheng; Salmerón, Miquel; Liu, Feng; He, Zhubing; Zhu, Rui; Russell, Thomas P.

doi:10.1016/j.joule.2020.06.007

Cited by 110 publications

(95 citation statements)

References 53 publications

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“…However, in the out‐of‐plane (OOP) direction, the PBDB‐T:BP‐BP blend showed a stronger (010) peak at 1.71 Å –1 , indicating that the π–π stacking of PBDB‐T can be enhanced by the BP‐BP. [ 38,39 ] The corresponding crystal coherence length (CCL) was calculated using a Scherrer analysis of the full width at half maximum (FWHM). The CCL of the (010) peak for PBDB‐T is 1.8 nm, which increased to 2.0 nm for the PBDB‐T:BP‐BP film.…”

Section: Resultsmentioning

confidence: 99%

Bifunctional Bis‐benzophenone as A Solid Additive for Non‐Fullerene Solar Cells

Fan

Sun

Zhang

et al. 2020

Adv Funct Materials

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Simultaneously improving efficiency and stability is critical for the commercial application of non‐fullerene acceptor polymer solar cells (NFA‐PSCs). Multifunctional solid additives have been considered as a potential route to tune the morphology of the active layer and optimize performance. In this work, photoinitiator bifunctional bis‐benzophenone (BP‐BP) is used as a solid additive, replacing solvent additives, in the PBDB‐T:ITIC NFA system. With the addition of BP‐BP, the intermolecular π–π stacking of PBDB‐T and morphology is improved, leading to more balanced carrier transport and more effective exciton dissociation. Devices fabricated with BP‐BP show a power conversion efficiency (PCE) of 11.89%, with enhanced short‐circuit current (Jsc), and fill factor (FF). Devices optimized with BP‐BP show excellent reproducibility, insensitivity to thickness, and an improved thermal stability under atmospheric conditions without encapsulation. This work provides a new strategy for the application of solid additives in NFA‐PSCs.

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Section: Resultsmentioning

confidence: 99%

Bifunctional Bis‐benzophenone as A Solid Additive for Non‐Fullerene Solar Cells

Fan

Sun

Zhang

et al. 2020

Adv Funct Materials

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“…On the other hand, INIC‐4F with a larger fused‐ring conjugated frameworks than that of ITIC‐4F showed an increased electron mobility from 10 −5 to 10 −4 cm 2 V −1 s −1 , which further improved the device PCE to 19.3 % with negligible loss after aging under ambient conditions for over 60 days [128] . In addition, another non‐fullerene acceptor with a fused‐unit dithienothiophen[3,2‐b]‐pyrrolobenzothiadiazole (TPBT) derivative, Y6, was applied to replace the commonly‐used PCBM for both defect passivation and electron transport materials (ETM) in n‐i‐p PSCs [129] . In this research, three typical solvents, chloroform (CF), toluene (Tol), and chlorobenzene (CB), were used to deposit the Y6 film to investigate the impact of the solvent system on the π–π stacking effect.…”

Section: Design Of Organic Frameworkmentioning

confidence: 99%

Defect Passivation for Perovskite Solar Cells: from Molecule Design to Device Performance

et al. 2021

ChemSusChem

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Perovskite solar cells (PSCs) are a promising third‐generation photovoltaic (PV) technology developed rapidly in recent years. Further improvement of their power conversion efficiency is focusing on reducing the non‐radiative charge recombination induced by the defects in metal halide perovskites. So far, defect passivation by the organic small molecule has been considered as a promising approach for boosting the PSC performance owing to their large structure flexibility adapting to passivating variable kinds of defect states and perovskite compositions. Here, the recent progress of defect passivation toward efficient and stable PSCs was reviewed from the viewpoint of molecular structure design and device performance. To comprehensively reveal the structure‐performance correlation of passivation molecules, it was separately discussed how the functional groups, organic frameworks, and side chains affect the corresponding PV parameters of PSCs. Finally, a guideline was provided for researchers to select more suitable passivation agents, and a perspective was given on future trends in development of passivation strategies.

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“…6), was recently used to replace the conventionally used PC61BM and to enhance the device efficiency together with the operational stability of p-i-n structured devices. 68 The presence of various functional groups on Y6, such as fluoro, cyano and sulfur, helped to increase the efficiency of electron transport, supress ion migration to improve device performance, trap passivation, and enhance near-infrared photocurrent. Though the device geometry constructed was complex, a PCE of 21.0% was achieved, with enhanced operational stability (up to 1,700 h) upon exposure to light, heat, and moisture.…”

Section: Organic Electron Transport Layer Materialsmentioning

confidence: 99%