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    Conjugated polymers with controllable interfacial order and energetics enable tunable heterojunctions in organic and colloidal quantum dot photovoltaics

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    Type
    Article
    Authors
    Zhong, Yufei cc
    Kirmani, Ahmad R. cc
    Lan, Xinzheng
    Carpenter, Joshua
    Chew, Annabel Rong-Hui
    Awartani, Omar cc
    Yu, Liyang cc
    Niazi, Muhammad Rizwan cc
    Voznyy, Oleksandr cc
    Hu, Hanlin cc
    Ngongang Ndjawa, Guy Olivier cc
    Tietze, Max Lutz
    Salleo, Alberto
    Ade, Harald
    Sargent, Edward H.
    Amassian, Aram cc
    KAUST Department
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Office of the VP
    Date
    2021-12-24
    Embargo End Date
    2022-12-24
    Submitted Date
    2021-11-06
    Permanent link to this record
    http://hdl.handle.net/10754/674942
    
    Metadata
    Show full item record
    Abstract
    Conjugated polymers are widely used as photoactive and transport layers in organic and hybrid photovoltaics (PV), where the energetics of polymers are a key design criterion. Here, we show that significant variations in terminal molecular ordering between top and bottom surfaces of a wide range of conjugated polymer films can result in sizable interfacial ionization energy (IE) differences by as much as 0.33 eV, which has significant impact on organic and hybrid PV devices. Such tunability is surprisingly seen even in nominally amorphous polymers. We devise a strategy leveraging wet and dry laminations to form donor–acceptor planar heterojunction (PHJ) devices using exposed and buried surfaces of donor polymers and demonstrate meaningful influence over the open circuit voltage (V$_OC$) by up to 0.32 V. We use this insight to devise a controlled intermixing approach which yields superior V$_OC$ and J$_SC$ to conventional bulk heterojunction devices by leveraging the disordered interface to maximize V$_OC$ and the greater aggregation of the donor to increase the J$_SC$. We go on to demonstrate how judicious control of polymer surface IE benefits charge extraction in colloidal quantum dot PV devices in the role of hole transport layers. Our results show that polymer interfacial and bulk properties are both critical to the functionality of optoelectronic devices and should both be given prime consideration when designing heterojunction devices.
    Citation
    Zhong, Y., Kirmani, A. R., Lan, X., Carpenter, J., Rong-Hui Chew, A., Awartani, O., … Amassian, A. (2022). Conjugated polymers with controllable interfacial order and energetics enable tunable heterojunctions in organic and colloidal quantum dot photovoltaics. Journal of Materials Chemistry A. doi:10.1039/d1ta09544g
    Sponsors
    Y. Zhong acknowledges funding supported by Zhejiang Provincial Natural Science Foundation of China under grant no Y22E021579. H. Ade, J. Carpenter and O. Awartani acknowledge funding supported under ONR N000141512322 and N000141712204.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    JOURNAL OF MATERIALS CHEMISTRY A
    DOI
    10.1039/d1ta09544g
    Additional Links
    http://xlink.rsc.org/?DOI=D1TA09544G
    ae974a485f413a2113503eed53cd6c53
    10.1039/d1ta09544g
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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