In Situ Combined‐Hole Transport Layer for Highly Efficient Perovskite Solar Cells

Zhao, Rongmei; Wang, Peng; Wang, Linqing; Zhao, Yuanju; Ge, Chenghao; Sun, Licheng; Xie, Lin; Hua, Yong

doi:10.1002/adfm.202307559

Cited by 8 publications

(2 citation statements)

References 60 publications

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“…Notably, the lower HOMO energy level and narrower E g of CY5 are advantageous for better interaction with the perovskite and efficient hole extraction. 34 Electrostatic surface potential (ESP) maps of CY3−CY5 are presented in Figure S1.…”

Section: Resultsmentioning

confidence: 99%

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Management of the π-Conjugated System in Carbazole–Diphenylamine Derivative-Based Hole-Transporting Materials for Perovskite Solar Cells: Theoretical Simulation and Experimental Research

Qi,

Wu,

Wang

et al. 2024

J. Phys. Chem. C

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Molecular design of hole transport materials (HTMs) is an important approach to improving the performance of perovskite solar cells (PSCs). In this work, starting from carbazole−diphenylamine derivatives, three HTMs, CY3−CY5, are designed to modulate the performance of HTMs by means of the introduction of different conjugation groups on the side chains. The theoretical simulation results indicate that the designed HTMs CY3−CY5 exhibit stable molecular structures, suitable frontier molecular orbital energy levels, and negative solvation free energies. Compared with CY3 and CY4, CY5 exhibits higher hole mobility due to its stronger orbital coupling. At the same time, CY5 in PSC applications can yield a stronger interfacial adsorption on the perovskite film. The experimental results provide important conditions for verifying the reliability of the theoretical model. Therefore, the optimized PSC devices based on CY5 achieve a significant power conversion efficiency (22.01%), which is better than the PSCs based on CY3 (21.28%) and CY4 (19.62%) under the same conditions. By combining theoretical calculations and experimental exploration, the feasibility of obtaining potential HTMs by means of π-conjugate extension to modulate the intermolecular orbital coupling and the interaction on the perovskite surface to improve the efficiency of PSCs are confirmed.

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Section: Resultsmentioning

confidence: 99%

“…This may be attributed to the increased molecular conjugation and electron delocalization characteristics. Notably, the lower HOMO energy level and narrower E g of CY5 are advantageous for better interaction with the perovskite and efficient hole extraction . Electrostatic surface potential (ESP) maps of CY3–CY5 are presented in Figure S1.…”

Section: Resultsmentioning

confidence: 99%

Management of the π-Conjugated System in Carbazole–Diphenylamine Derivative-Based Hole-Transporting Materials for Perovskite Solar Cells: Theoretical Simulation and Experimental Research

Qi,

Wu,

Wang

et al. 2024

J. Phys. Chem. C

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Ionic‐Rich Vermiculite Tailoring Dynamic Bottom‐Up Gradient for High‐Efficiency Perovskite Solar Cells

Zhang,

Li,

Duan

et al. 2024

Adv Funct Materials

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Mixed‐halide perovskites are emerging as excellent photovoltaic candidates because of their tunable bandgaps for semitransparent and tandem perovskite solar cells. However, the notorious film quality originated from the rapidly downward crystallization process susceptibly propagates enormous detrimental defects, which deteriorate the photovoltaic performance and accelerate halide segregation. To address this issue, herein, a multilayer alkalis‐intercalated‐vermiculite is employed as pre‐buried interface modifier to regulate the perovskite lattice property. The matchable lattice structure between perovskite and vermiculite by forming Pb─O bond not only releases the interfacial strain during the film growth but also the embedded alkalis ions can gradually diffuse into perovskite lattice to form a favorable vertical gradient owing to the weak interlamellar van der Waals interaction, playing bis‐roles of atomical lubricant and ion‐reservoir to eliminate detrimental defects. As a result, the film quality and lattice stability is significantly improved with suppressed phase segregation for mixed‐halide perovskites, accompanying a champion efficiency of 11.42% for carbon‐based CsPbIBr2 device, 15.25% for carbon‐based CsPbI2Br device and 23.17% for p‐i‐n inverted (Cs0.05MA0.05FA0.9)Pb(I0.93Br0.07)3 cell. This work provides a new strategy on buried interface engineering for making high‐efficiency and stable perovskite platforms.

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Biomass Derived Self‐Doped Carbon Nanosheets Enable Robust Hole Transport Layers with Ion Buffer for Perovskite Solar Cells

Qiu,

Xu,

Tian

et al. 2024

ChemSusChem

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The diffusion of iodine species and lead leakage during device degradation represent the main obstacles restricting the commercial application of perovskite solar cells (PSCs). Cobalt loaded ultrathin carbon nanosheets (Co(III)‐CNS) derived from biomass are prepared as ion buffer material to construct robust hole transport layers (HTLs). The carbon nanosheets containing trivalent cobalt ions can facilitate the oxidation of the hole transport material while preserving the structural integrity and electrical properties of HTLs under thermal stress, thereby ensuring efficient carrier transport. The two‐dimensional ultrathin graphitized lamellar structure of Co(III)‐CNS is conducive to alleviate the corrosive effects of the outward diffusion of iodine species on HTLs and silver electrodes, while avoiding irreversible degradation of PSCs. With the improvement of HTL composition and the related interfaces, Co(III)‐CNS doped devices can maintain intact device structure under thermal stress and remain above 80 % of the original power conversion efficiency (PCE) after thermal aging at 85 °C for 720 h. Notably, the chemical interactions between heteroatoms of self‐doped carbon nanosheets and the mobile lead ions can effectively alleviate lead leakage and avoid the potential impacts of device degradation on ecosystem. Ultimately, the Co(III)‐CNS doped PSCs with enhanced thermal stability exhibit a champion PCE of 22.32 %.

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In Situ Combined‐Hole Transport Layer for Highly Efficient Perovskite Solar Cells

Cited by 8 publications

References 60 publications

Management of the π-Conjugated System in Carbazole–Diphenylamine Derivative-Based Hole-Transporting Materials for Perovskite Solar Cells: Theoretical Simulation and Experimental Research

Management of the π-Conjugated System in Carbazole–Diphenylamine Derivative-Based Hole-Transporting Materials for Perovskite Solar Cells: Theoretical Simulation and Experimental Research

Ionic‐Rich Vermiculite Tailoring Dynamic Bottom‐Up Gradient for High‐Efficiency Perovskite Solar Cells

Biomass Derived Self‐Doped Carbon Nanosheets Enable Robust Hole Transport Layers with Ion Buffer for Perovskite Solar Cells

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