Research Progress of Self-assembled Hole-transporting Monolayers in Inverted Perovskite Solar Cells

Liu, Xuepeng; Li, Botong; Han, Mingyuan; Zhang, Xianfu; Chen, Jianlin; Dai, Songyuan

doi:10.6023/a24010026

Cited by 3 publications

(1 citation statement)

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“…We also made relevant attempts in inverted devices with p-i-n structures to evaluate the performance of ThPCyAc in practical applications. The 2-cyanoacrylic acid functional group, as a common characteristic functional group in dye molecules, has been proven to have anchoring function and can form a monolayer on the surface of ITO through a self-assembled method. − As shown in Figure , when we used it as SAM, the related inverted device achieved a higher PCE (20.11%) than the control group (19.29%) due to their ultrahigh FF. This thought-provoking discovery also demonstrates the feasibility of dye molecules in reversed PSCs.…”

Section: Results and Discussionmentioning

confidence: 99%

A Multifunctional Dye Molecule as the Interfacial Layer for Perovskite Solar Cells

Chen,

Zhang,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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In perovskite solar cells (PSCs), defects in the interface and mismatched energy levels can damage the device performance. Improving the interface quality is an effective way to achieve efficient and stable PSCs. In this work, a multifunctional dye molecule, named ThPCyAc, was designed and synthesized to be introduced in the perovskite/HTM interface. On one hand, various functional groups on the acceptor unit can act as Lewis base to reduce defect density and suppress nonradiative combinations. On the other hand, the stepwise energy-level alignment caused by ThPCyAc decreases the accumulation of interface carriers for facilitating charge extraction and transmission. Therefore, based on the ThPCyAc molecule, the devices exhibit elevated open-circuit voltage and fill factor, resulting in the best power conversion efficiency (PCE) of 23.16%, outperforming the control sample lacking the interface layer (PCE = 21.49%). Excitingly, when attempting to apply it as a self-assembled layer in inverted devices, ThPCyAc still exhibits attractive behavior. It is worth noting that these results indicate that dye molecules have great potential in developing multifunctional interface materials to obtain higher-performance PSCs.

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