20.5 % efficient ternary organic photovoltaics using an asymmetric small-molecular acceptor to manipulate intermolecular packing and reduce energy losses

Oligomeric acceptors are increasingly recognized as promising n-type materials for organic photovoltaics (OPVs) due to their precise molecular structures, long-term stability, and high efficiency. However, inferior molecular packing and high energy losses have hindered their further use. Here, we overcome these challenges by developing an asymmetric small molecular acceptor (SMA), BTP-J17, and applying it as the second acceptor component in OPVs composed of PM6:DIBP3F-Se:BTP-J17 (refer to our recent work on dimeric acceptor DIBP3F-Se). The BTP-J17 is very miscible with the DIBP3F-Se and appears to diffuse into the host donor-acceptor interface. The ensuing ternary cells exhibit enhanced exciton dissociation, improved carrier mobility, and more efficient charge extraction. Optimised OPVs based on PM6:DIBP3F-Se:BTP-J17 show enhanced open-circuit voltage ( V OC ) while maintaining the high short-circuit current ( J SC ) from the binary blends, boosting the power conversion efficiency (PCE) from 18.40 % to 19.60 %. By integrating MgF 2 as an antireflection coating and n-doping the ternary BHJ with ethyl viologen (EV), we were able to further boost the PCE to 20.5 % (uncertified) and simultaneously extended the outdoor stability to seven weeks. Our findings highlight the crucial role of asymmetric SMA as an additional component for boosting the performance and stability of OPVs.

Authors

Institutions

Publication Details

Journal
Materials Science and Engineering R Reports
Published
2024-12-25
DOI
https://doi.org/10.1016/j.mser.2024.100922
Citations
31
Primary Topic
Organic Electronics and Photovoltaics
Type
article
Field-Weighted Citation Impact
6.47

Funders

Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

20.5 % efficient ternary organic photovoltaics using an asymmetric small-molecular acceptor to manipulate intermolecular packing and reduce energy losses

Mohamad Insan Nugraha, Maxime Babics, Spyros Doukas, Hendrik Faber et al.
31 citations
Materials Science and Engineering R Reports
Organic Electronics and Photovoltaics
6.47
article

20.5 % efficient ternary organic photovoltaics using an asymmetric small-molecular acceptor to manipulate intermolecular packing and reduce energy losses

Mohamad Insan Nugraha, Maxime Babics, Spyros Doukas, Hendrik Faber, Zhaoheng Ling, Ergang Wang, José P. Jurado, Thomas D. Anthopoulos, Donghong Yu, Maryam Alqurashi, Hanlin Hu, Sang Young Jeong, Han Young Woo, Stefaan De Wolf, Frédéric Laquai, Elefterios Lidorikis, Leonidas Tsetseris, Christopher E. Petoukhoff, Dipti R. Naphade, Yuanbao Lin, Mingjie He, Jingnan Wu, Xiaokang Sun, Xiaoming Chang
article en
31 citations

Abstract

Oligomeric acceptors are increasingly recognized as promising n-type materials for organic photovoltaics (OPVs) due to their precise molecular structures, long-term stability, and high efficiency. However, inferior molecular packing and high energy losses have hindered their further use. Here, we overcome these challenges by developing an asymmetric small molecular acceptor (SMA), BTP-J17, and applying it as the second acceptor component in OPVs composed of PM6:DIBP3F-Se:BTP-J17 (refer to our recent work on dimeric acceptor DIBP3F-Se). The BTP-J17 is very miscible with the DIBP3F-Se and appears to diffuse into the host donor-acceptor interface. The ensuing ternary cells exhibit enhanced exciton dissociation, improved carrier mobility, and more efficient charge extraction. Optimised OPVs based on PM6:DIBP3F-Se:BTP-J17 show enhanced open-circuit voltage ( V OC ) while maintaining the high short-circuit current ( J SC ) from the binary blends, boosting the power conversion efficiency (PCE) from 18.40 % to 19.60 %. By integrating MgF 2 as an antireflection coating and n-doping the ternary BHJ with ethyl viologen (EV), we were able to further boost the PCE to 20.5 % (uncertified) and simultaneously extended the outdoor stability to seven weeks. Our findings highlight the crucial role of asymmetric SMA as an additional component for boosting the performance and stability of OPVs.

Materials Science and Engineering R ReportsVol. 163
National Technical University of Athens (GR), Shenzhen Polytechnic University (CN), University of Ioannina (GR), Korea University (KR), Guangzhou University (CN), National Nuclear Energy Agency of Indonesia (ID), Korea University (JP), Chalmers University of Technology (SE), King Abdullah University of Science and Technology (SA), University of Hong Kong (HK), Aalborg University (DK), South China University of Technology (CN)
European Commission, National Research Foundation, Swedish Foundation for International Cooperation in Research and Higher Education, Svenska Forskningsrådet Formas, National Research Foundation of Korea, King Abdullah University of Science and Technology, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Sino-Danish Center, Horizon 2020 Framework Programme, Engineering and Physical Sciences Research Council
Affordable and clean energy
Openalex Percentile: Top 3%
Organic Electronics and Photovoltaics
6.47
DOIOpen Access PDFOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.