High Detectivity Near Infrared Organic Photodetectors Using an Asymmetric Non-Fullerene Acceptor for Optimal Nanomorphology and Suppressed Dark Current
- Jong-Woon HaJong-Woon HaEnergy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of KoreaMore by Jong-Woon Ha
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- Ah Young LeeAh Young LeeDepartment of Molecular Science and Technology, Ajou University, Suwon, 16499, Republic of KoreaMore by Ah Young Lee
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- Hyeong Ju EunHyeong Ju EunDepartment of Molecular Science and Technology, Ajou University, Suwon, 16499, Republic of KoreaMore by Hyeong Ju Eun
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- Jae-Hyun KimJae-Hyun KimDepartment of Electrical and Computer Engineering, Ajou University, Suwon, 16499, Republic of KoreaMore by Jae-Hyun Kim
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- Hyungju Ahn
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- Sungjun ParkSungjun ParkDepartment of Electrical and Computer Engineering, Ajou University, Suwon, 16499, Republic of KoreaMore by Sungjun Park
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- Changjin LeeChangjin LeeEnergy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of KoreaMore by Changjin Lee
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- Deok Won SeoDeok Won SeoDepartment of Electrical and Computer Engineering, Ajou University, Suwon, 16499, Republic of KoreaMore by Deok Won Seo
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- Junseok HeoJunseok HeoDepartment of Electrical and Computer Engineering, Ajou University, Suwon, 16499, Republic of KoreaMore by Junseok Heo
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- Sung Cheol Yoon*Sung Cheol Yoon*(S.C.Y.) Email: [email protected]Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of KoreaMore by Sung Cheol Yoon
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- Seo-Jin Ko*Seo-Jin Ko*(S.-J.K.) Email: [email protected]Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of KoreaMore by Seo-Jin Ko
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- Jong H. Kim*Jong H. Kim*(J.H.K.) Email: [email protected]Department of Molecular Science and Technology, Ajou University, Suwon, 16499, Republic of KoreaMore by Jong H. Kim
Abstract
Recently, the development of non-fullerene acceptors (NFAs) for near-infrared (NIR) organic photodetectors (OPDs) has attracted great interest due to their excellent NIR light absorption properties. Herein, we developed NFAs by substituting an electron-donating moiety (branched alkoxy thiophene (BAT)) asymmetrically (YOR1) and symmetrically (YOR2) for the Y6 framework. YOR1 exhibited nanoscale phase separation in a film blended with PTB7-Th. Moreover, substituting the BAT unit effectively extended the absorption wavelengths of YOR1 over 1000 nm by efficient intramolecular charge transfer and extension of the conjugation length. Consequently, YOR1-OPD exhibited significantly reduced dark current and improved responsivity by simultaneously satisfying optimal nanomorphology and significant suppression of charge recombination, resulting in 1.98 × 1013 and 3.38 × 1012 Jones specific detectivity at 950 and 1000 nm, respectively. Moreover, we successfully demonstrated the application of YOR1-OPD in highly sensitive photoplethysmography sensors using NIR light. This study suggests a strategic approach for boosting the overall performance of NIR OPDs targeting a 1000 nm light signal using an all-in-one (optimal morphology, suppressed dark current, and extended NIR absorption wavelength) NFA.
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