Eliminating the Imbalanced Mobility Bottlenecks via Reshaping Internal Potential Distribution in Organic Photovoltaics

The imbalanced carrier mobility remains a bottleneck for performance breakthrough in even those organic solar cells (OSCs) with recorded power conversion efficiencies (PCEs). Herein, a counter electrode doping strategy is proposed to reshape the internal potential distribution, which targets to extr...

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Bibliographic Details
Published in:Advanced science 2023-10, Vol.10 (29), p.e2302880-n/a
Main Authors: Cui, Yu, Zhao, Chao, Souza, João Paulo Araújo, Benatto, Leandro, Koehler, Marlus, Ma, Wei, Yan, Han
Format: Article
Language:English
Subjects:
Chemistry
dilute bulk heterojunction
Electric fields
Electric properties
electrical doping
Electrodes
imbalanced carrier mobility
internal potential distribution
Materials Science
Morphology
organic solar cell
Science & Technology - Other Topics
semitransparent device
Simulation
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Summary:The imbalanced carrier mobility remains a bottleneck for performance breakthrough in even those organic solar cells (OSCs) with recorded power conversion efficiencies (PCEs). Herein, a counter electrode doping strategy is proposed to reshape the internal potential distribution, which targets to extract the low mobility carriers at far end. Device simulations reveal that the key of this strategy is to partially dope the active layer with a certain depth, therefore it strengthens the electric field for low mobility carriers near counter electrode region while avoids zeroing the electric field near collection electrode region. Taking advantage of these, PCE enhancements are obtained from 15.4% to 16.2% and from 16.9% to 18.0%, respectively, via cathode p‐doping and anode n‐doping. Extending its application from opaque to semitransparent devices, the PCE of dilute cell rises from 10.5% to 12.1%, with a high light utilization efficiency (LUE) of 3.5%. The findings provide practical solutions to the core device physical problem in OSCs. Counter‐electrode doping strengthens the low mobility carrier collection at the far end by reshaping the internal electric potential distribution within the active layer. Applying this strategy to semitransparent devices, a good balance between PCE and AVT is achieved to produce a higher LUE.
ISSN:2198-3844
2198-3844
DOI:10.1002/advs.202302880