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

Cui, Yu; Zhao, Chao; Souza, João Paulo Araújo; Benatto, Leandro; Koehler, Marlus; Ma, Wei; Yan, Han

doi:10.1002/advs.202302880

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

Journal Article · 27 August 2023 · Advanced Science

DOI: https://doi.org/10.1002/advs.202302880 · OSTI ID:2471076

Cui, Yu ^[1]; Zhao, Chao ^[1];

^[2];

^[2]; Ma, Wei ^[1];

^[1]

Xi'an Jiaotong Univ., Shaanxi (China)
Federal Univ. of Paraná, Curitiba (Brazil)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2471076

Journal Information:: Advanced Science, Journal Name: Advanced Science Journal Issue: 29 Vol. 10; ISSN 2198-3844

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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