研究目的
To develop a novel strategy for defects passivation in ZnO electron transport layers (ETLs) to enhance the performance of polymer solar cells (PSCs) by introducing 4-tert-butylpyridine (TBP) agent into the precursor solution.
研究成果
The introduction of TBP into the ZnO precursor solution effectively passivates defects in the ETL, leading to improved interfacial contact, reduced exciton quenching, and enhanced charge carrier collection. This results in significant improvements in Jsc and PCE for both fullerene and nonfullerene-based PSCs. The strategy is simple and universally applicable, offering a promising approach for the development of high-performance PSCs.
研究不足
The study focuses on the passivation of defects in ZnO ETLs using TBP and its impact on PSC performance. However, the long-term stability of these devices and the scalability of the fabrication process are not addressed. Additionally, the mechanism of defect passivation by TBP could be further explored at the molecular level.
1：Experimental Design and Method Selection:
The study involved the preparation of ZnO precursor solutions with and without TBP agent, followed by the fabrication of inverted PSCs using these ETLs. The performance of these devices was then characterized.
2：Sample Selection and Data Sources:
The active materials used were PTB7:PC71BM and PBDB-T-2F:IT-4F blends. The devices were fabricated on ITO-coated glass substrates.
3：List of Experimental Equipment and Materials:
Instruments included a spin-coater for film deposition, a thermal evaporator for electrode deposition, and a Newport system for J-V and EQE measurements. Materials included ZnO precursor components, TBP, PTB7, PC71BM, PBDB-T-2F, IT-4F, and MoO
4：Experimental Procedures and Operational Workflow:
The ZnO precursor was prepared and spin-coated onto ITO substrates, followed by annealing. The active layer was then spin-coated, and electrodes were deposited via thermal evaporation. The devices were characterized under simulated AM 1.5G illumination.
5：5G illumination.
Data Analysis Methods:
5. Data Analysis Methods: The performance parameters (Voc, Jsc, FF, PCE) were extracted from J-V curves. EQE spectra were analyzed to understand the photocurrent generation. AFM, SEM, FT-IR, PL, and EIS were used to study the morphology, structure, and electronic properties of the ETLs and devices.
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