研究目的
To maximize the open-circuit voltage (VOC) of organic solar cells (OSCs) by designing a non-fullerene acceptor ITCCM-O with a bandgap of 2.0 eV and blending it with a polymer donor J52 to achieve high power conversion efficiencies (PCEs).
研究成果
The study successfully designed and synthesized a new non-fullerene acceptor ITCCM-O, achieving a high PCE of 5.5% with an outstanding VOC of 1.34 V in OSCs. The high VOC was attributed to the low driving force for charge generation and the low non-radiative recombination loss. The results suggest that fine-tuning the chemical structure of organic photovoltaic materials can further decrease energy losses and improve the PCEs of OSCs.
研究不足
The relatively low fill factor (FF) is caused by the suboptimal morphology of the blend films, indicating a need for further morphology optimizations to elevate the FF and Jsc values for ITCCM-O-based OSCs.
1：Experimental Design and Method Selection:
The study involved the design and synthesis of a new non-fullerene acceptor ITCCM-O by modulating the end-groups to reduce energy losses. The methodology included density functional theory (DFT) for studying the impact of end-group modulations on energy levels and dipole moments.
2：Sample Selection and Data Sources:
The polymer donor J52 and the newly synthesized acceptor ITCCM-O were used. The materials were characterized using UV-Vis absorption spectra, square-wave voltammetry, and photoluminescence (PL) spectra.
3：List of Experimental Equipment and Materials:
Equipment included a conventional device structure for photovoltaic performance study, UV-Vis spectrophotometer, square-wave voltammetry setup, and photoluminescence measurement setup. Materials included chlorobenzene as the processing solvent and 1,8-diiodooctane (DIO) as the solvent additive.
4：Experimental Procedures and Operational Workflow:
The active layer films were prepared by spin coating and treated by thermal annealing. The devices were fabricated with a structure of ITO/PEDOT:PSS/active layer/PFN-Br/Al.
5：Data Analysis Methods:
The study analyzed the photovoltaic performance through current density versus voltage (J-V) curves, external quantum efficiency (EQE) spectra, and charge carrier mobility measurements using photo-CELIV and SCLC methods.
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