Molecular Doping Increases the Semitransparent Photovoltaic Performance of Dilute Bulk Heterojunction Film with Discontinuous Polymer Donor Networks

Tang, Yabing; Zheng, Hong; Zhou, Xiaobo; Tang, Zheng; Ma, Wei; Yan, Han

doi:10.1002/smtd.202101570

Title: Molecular Doping Increases the Semitransparent Photovoltaic Performance of Dilute Bulk Heterojunction Film with Discontinuous Polymer Donor Networks

Journal Article · 08 February 2022 · Small Methods

DOI: https://doi.org/10.1002/smtd.202101570 · OSTI ID:1981445

Tang, Yabing ^[1]; Zheng, Hong ^[1]; Zhou, Xiaobo ^[1]; Tang, Zheng ^[2]; Ma, Wei ^[1];

^[1]

Xi'an Univ. of Technology, Xi'an, Shaanxi (China)
Donghua University, Shanghai (China)

The semitransparent and colorful properties of organic solar cells (OSCs) attract intensive academic interests due to their potential application in building integrated photovoltaics, wearable electronics, and so forth. The most straightforward and effective method to tune these optical properties is varying the componential ratio in the blend film. However, the increase in device transmittance inevitably sacrifices the photovoltaic performance because of severe carrier recombination that originates from discontinuous charge-transport networks in the blend film. In this work, a strategy is proposed via the molecular-doping strategy to overcome these shortcomings. It is discovered that p-doping is able to release the trapped holes in segregated polymer domains leading to short-circuit current enhancement, while n-doping is more effective to fill the bandgap states producing a higher fill factor. More importantly, either type of doping improves the photovoltaic performance in the semitransparent photovoltaic devices. These discoveries provide a new pathway to breaking the compromise between the photovoltaic performance and optical transmittance in semitransparent OSCs, and hold promise for their future commercialization.

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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:: 1981445

Journal Information:: Small Methods, Journal Name: Small Methods Journal Issue: 4 Vol. 6; ISSN 2366-9608

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Molecular Doping Increases the Semitransparent Photovoltaic Performance of Dilute Bulk Heterojunction Film with Discontinuous Polymer Donor Networks

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