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Oligo(aniline)-based Hole Transport Layer for Organic Solar Cells
Ngoc-Lan Phan Tan,김진석,김범준 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
The contribution of interfacial layers to device performance and stability is considered important. The most widely used hole transport layer (HTL) for conventional organic solar cells (OSCs)–PEDOT:PSS has some shortcomings such as the acidity and the hygroscopicity which cause the limitation for long-term stability. In this study, we report the doping system of an aniline derivative (PTA) and an aryl sulfonic acid (NSO-2), which can be employed as HTL for OSCs. Devices fabricated from this HTL on PM6:Y6 active layers exhibited comparative power conversion efficiency (PCE) with control device of PEDOT:PSS (14.94% vs. 15.05%). Moreover, the devices with PTA:NSO-2 HTL also emphasizes its better moisture stability than PEDOT:PSS. Therefore, this initial result demonstrates the potential of aniline-based materials as HTL for OSCs as well as motivates the further optimization to achieve the higher photovoltaic performance.
Ngoc-Lan Phan Tan,김진석,이승진,김건우,김범준 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The selection of interfacial layers in organic solar cells (OSCs) is crucial for enhancing their power conversion efficiency (PCE) and stability. PEDOT:PSS is the most widely used hole transport layer (HTL); however, device stability is often severely degraded, owing to the strong acidity and hygroscopicity of PEDOT:PSS. Herein, we report a new efficient HTL system comprising an oligo(aniline) host (PBD) and a protonic acid dopant (PFBSA), and demonstrate its use in OSC devices. Desirable properties like high transmittance, excellent conductivity, and appropriate work function establish the suitability of the PBD:PFBSA film as an HTL. Thus, a PBD:PFBSA HTL is employed in the PM6:Y6-based OSC system to achieve a PCE of 15.24%. Importantly, the PBD:PFBSA HTL-based OSC exhibits significantly higher device stability than the PEDOT:PSS HTL. Our results highlight the successful design of an oligo(aniline)-based material and its practical application as an effective HTL for OSCs.
정다현,이진우,김동준,Ngoc-Lan Tan Phan,박진수,김택수,김범준 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Development of polymer solar cells with high photovoltaic performance and mechanical robustness is one of the foremost tasks for ensuring operational reliability and applicability into stretchable power generators of wearable devices. However, the approach to achieve both requirements still lacks due to the difficulty in enhancing mechanical stability without disrupting the electrical properties of active materials. Here, we develop novel polymer donors (PDs), interposing a flexible spacer (FS) into the backbone of PM6 through random terpolymerization. The controlled contents of FSs in PDs lead to highly miscible blend morphologies, which enable suppressed charge recombination and mechanical endurance from stress dissipation effect. Resultingly, the optimal PD affords superb power conversion efficiency of 17% with crack onset strain of 12%, surpassing those of PM6. This work demonstrates the promising strategy to overcome mechanical inferiority of state-of-the-art active blends.