Improving the Performance of Layer‐by‐Layer Processed Organic Solar Cells via Introducing a Wide‐Bandgap Dopant into the Upper Acceptor Layer

The layer‐by‐layer (LbL) solution‐processed organic solar cells (OSCs) are conductive to achieve vertical phase separation, tunable donor–acceptor (D/A) interfaces, and favorable charge‐transport pathways. In this work, a wide‐bandgap component poly(9‐vinylcarbazole) (PVK) is added to the upper elec...

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Veröffentlicht in:Advanced materials (Weinheim) 2023-07, Vol.35 (28), p.e2211372-n/a
Hauptverfasser: Chen, Qiaoling, Huang, Hao, Hu, Di, Zhang, Cai'e, Xu, Xinjun, Lu, Hao, Wu, Yonggang, Yang, Chuluo, Bo, Zhishan
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container_issue 28
container_start_page e2211372
container_title Advanced materials (Weinheim)
container_volume 35
creator Chen, Qiaoling
Huang, Hao
Hu, Di
Zhang, Cai'e
Xu, Xinjun
Lu, Hao
Wu, Yonggang
Yang, Chuluo
Bo, Zhishan
description The layer‐by‐layer (LbL) solution‐processed organic solar cells (OSCs) are conductive to achieve vertical phase separation, tunable donor–acceptor (D/A) interfaces, and favorable charge‐transport pathways. In this work, a wide‐bandgap component poly(9‐vinylcarbazole) (PVK) is added to the upper electron acceptor layer to improve the performance of LbL‐processed OSCs. Results show that the PVK component can adjust the film morphology, dope the electron acceptor, increase the electron concentration, and improve charge transport. Such n‐type doping is verified by Seebeck coefficient measurement, ultraviolet photoelectron spectroscopy, and electron paramagnetic resonance characterization. In addition, the fluorescence intensity and exciton lifetime of the PVK‐doped acceptor film are increased, thus being beneficial for exciton diffusion to the D/A interface. Therefore, the power conversion efficiency (PCE) of LbL OSCs increases when 2.50 wt.% PVK is employed in the electron acceptor layer of commonly‐used high‐efficiency system and a maximum value of 19.05% can be achieved. The role of PVK played in the active layer is different from those of additives and ternary components reported previously, so the results provide an alternative way to enhance the device performance of LbL‐processed OSCs. Wide‐bandgap polymer poly(9‐vinylcarbazole) (PVK) is added to the acceptor layer of layer‐by‐layer organic solar cells (OSCs). Besides enhancing molecular stacking, PVK n‐dopes the electron acceptor, increases the electron concentration, and improves charge transport, leading to elevated power conversion efficiency in OSCs, especially for the D18/L8‐BO active layer which demonstrates device efficiency over 19% with PVK addition.
doi_str_mv 10.1002/adma.202211372
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source Wiley Online Library Journals Frontfile Complete
subjects Additives
charge carrier concentrations
Charge transport
Electron paramagnetic resonance
Energy conversion efficiency
Energy gap
Excitons
layer‐by‐layer structures
Materials science
n‐type dopings
organic solar cells
Performance enhancement
Phase separation
Photoelectrons
Photovoltaic cells
Polyvinyl carbazole
quasi‐planar heterojunctions
Seebeck effect
Solar cells
Vertical separation
title Improving the Performance of Layer‐by‐Layer Processed Organic Solar Cells via Introducing a Wide‐Bandgap Dopant into the Upper Acceptor Layer
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