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은형주,계효진,김다희,진인수,정대웅,고서진,허준석,김봉기,김종현 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Near-infrared organic photodetectors (NIR OPDs) have attracted considerable attention because of their inherent advantages. In particular, the development of NIR detection at 900-950 nm is crucial for noise-free communication in ambient environments. In this work, we demonstrate high-detectivity NIR OPDs by employing a non-fullerene acceptor (ITIC) used with a NIR-absorbing conjugated polymer (PNIR) for bulk heterojunction (BHJ), which significantly suppressed dark current. Systemic characterizations including electrical, structural, and morphological analyses revealed that ITIC effectively reduces charge recombination during the operation of the OPDs under NIR illumination, resulting in dark current reduction and high-detectivity of over 3.2ⅹ1011 Jones at 900–950 nm. The results presented demonstrate that utilizing a non-fullerene acceptor for BHJ-type NIR OPDs is evidently a strategic approach for the simultaneous achievement of low-dark current and high-detectivity of NIR OPDs.
은형주,계효진,김다희,진인수,정재웅,고서진,허준석,김봉기,김종현 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Near-infrared organic photodetectors (NIR OPDs) have attracted considerable attention as next-generation energy devices because of their low-cost fabrication, low-weight, and ease of fabrication using a solution process. In this study, organic bulk heterojunction (BHJ) photodetectors were fabricated and OPDs were fabricated by mixing a Near-infrared (NIR)-absorbing conjugated polymer Diketopyrrolopyrrole (DPP) electron donor and electron acceptor. The photoelectric effect was compared and analyzed by comparing the fullerene (PC71BM) and non-fullerene (ITIC) conjugated single molecule as an electron acceptor. Through electrical and morphological analysis, the characteristics of NIR organic photoelectric devices that vary depending on the electron acceptor are compared. The results presented here demonstrate that utilizing a non-fullerene acceptor for BHJ-type NIR OPDs is evidently a strategic approach for the simultaneous achievement of the low dark current and high-detectivity of NIR OPDs.
풀러렌 및 비 풀러렌 억셉터 기반 유기물 포토다이오드의 근적외선 광전변환특성 비교
은형주(Hyeong Ju Eun),계효진(Hyojin Kye),김다희(Dahee Kim),진인수(In Su Jin),정재웅(Jae Woong Jung),고서진(Seo-Jin Ko),허준석(Junseok Heo),김봉기(Bong-Gi Kim),김종현(Jong Hyun Kim) 한국태양에너지학회 2021 한국태양에너지학회 학술대회논문집 Vol.2021 No.5
유기물 광전 소자는 용액 공정을 이용한 저비용, 저중량, 공정상에서의 용이함으로 차세대 에너지 소자로써 각광을 받고 있다. 본 연구에서는 유기물 벌크 이종접합 광전 소자를 제작하여 근적외선 영역까지 흡수하는 공액 고분자 Diketopyrrolopyrrole(DPP) 전자 주개와 전자 받개를 혼합하여 광전 소자를 제작하였다. 전자 받개로 풀러렌(PC71BM)과 비 풀러렌(ITIC) 공액 단분자를 비교하여 광전 효과를 비교 분석하였고, PC71BM 대비 ITIC 기반의 소자는 암전류의 약 10<sup>2</sup>배 감소로 인하여 900-950nm 근적외선 광대역에서 우수한 광전변환특성을 나타내었다. 전기적 및 모폴로지 분석을 통하여 전자 받개에 따라 달라지는 유기물 근적외선 광전 소자의 특성을 비교하고, 비풀러렌 억셉터도입을 통한 초저수준의 암전류 유지 전략은 유기물 근적외선 광전 소자의 광전변환성능 최적화를 위해 매우 효과적인 접근법임을 밝혔다.
서경욱,은형주,김태동,김종현 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Organic photodetectors (OPDs) overcome the disadvantages of the traditional inorganic photodetectors in terms of their unique features, such as rich in varieties, light weight, ease of processing, large-area scalability, and high flexibility. Among them, photo-responsive materials used in OPDs have low band gap energy, and dark current is likely to occur by other factors except light. Poly(3,4-ethylenedioxythiophene):poly (styrenesulfonate) (PEDOT:PSS) was used as typical hole transport layer. The contact angle between a liquid film and a solid substrate is treated in the van der Waals Model, and it has an important role in defects and dark current between the interfaces. We mainly improved the dark current, using the Hydrophobic modified PEDOT:PSS-co-TF (TF) and hydrophilic modified PEDOT:PSS-co-PA (PA) instead of PEDOT:PSS. The TF leads to suppressed defects, followed by a sharp decrease in the dark current of TF-based OPDs by 5.60 × 10<SUP>-8</SUP> A/cm² from 1.05 × 10<SUP>-6</SUP> A/cm² at -1 V.