Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 38, Pages 32939-32945Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b09757
Keywords
organic solar cells; wide band gap polymer; fullerene-free solar cells; complementary absorption; low energy loss
Funding
- New and Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry and Energy, Republic of Korea [20163030013960]
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science, ICT and Future Planning [NRF-2016M1A2A2940912]
- National Research Foundation (NRF) grant - Korean Government [2016R1A5A1012966, 2017R1A2B2009178, 2017R1C1B2010694]
- Global Scholarship Program for Foreign Graduate Students at Kookmin University in Korea
- National Research Foundation of Korea [2017R1C1B2010694, 2017R1A2B2009178, 22A20130012860] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Although the combination of wide band gap polymer donors and narrow band gap small-molecule acceptors achieved state-of-the-art performance as bulk heterojunction (BHJ) active layers for organic solar cells, there have been only several of the wide band gap polymers that actually realized high-efficiency devices over >10%. Herein, we developed high-efficiency, low-energy-loss fullerene-free organic solar cells using a weakly crystalline wide band gap polymer donor, PBDTTPD-HT, and a nonfullerene small-molecule acceptor, ITIC. The excessive intermolecular stacking of ITIC is efficiently suppressed by the miscibility with PBDTTPD-HT, which led to a well-balanced nanomorphology in the PBDTTPD-HT/ITIG BHJ active films. The favorable optical; electronic, and energetic properties of PBDTTPD-HT with respect to ITIC achieved panchromatic photon-to-current conversion with a remarkably low energy loss (0.59 eV).
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