研究目的
Investigating the impact of ambient moisture on the photovoltaic performance of conventional PCBM and emerging polymer acceptor–based organic solar cells, and comparing the device performance, stability, and processing conditions between polymer–PCBM and all-polymer solar cells.
研究成果
All-polymer solar cells exhibit superior moisture-tolerance and long-term stability compared to polymer–PCBM counterparts, making them more suitable for ambient processing and practical large-scale production. The findings highlight the potential of all-polymer solar cells for commercialization due to their high performance and stability under various environmental conditions.
研究不足
The study focuses on the impact of moisture and ambient conditions on device performance and stability, but does not extensively explore the underlying chemical interactions or degradation mechanisms. The comparison is limited to PCBM and N2200 as acceptors, and further studies could include a broader range of materials.
1：Experimental Design and Method Selection:
The study employed inverted device structures with ZnO as the electron transporting material, polymer–PCBM or polymer–N2200 BHJ blend as the light harvester, MoO3 as the hole transporting material, and silver as the electrode. The impact of humidity on device performance was examined by processing devices under varying humidity conditions.
2：Sample Selection and Data Sources:
Two p-type polymers, PBDB-T and PTzBI, were blended with either PCBM or N2200. Devices were fabricated and characterized under controlled humidity conditions.
3：Devices were fabricated and characterized under controlled humidity conditions.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Instruments included a spin coater for film deposition, a glovebox for controlled humidity processing, and characterization tools such as photoluminescence (PL) measurements, atomic force microscope (AFM), Raman spectroscopy, grazing-incidence wide-angle X-ray scattering (GIWAXS), and ultraviolet photoelectron spectroscopy (UPS).
4：Experimental Procedures and Operational Workflow:
Devices were fabricated by spin-coating the active layer under varying humidity levels, followed by thermal evaporation of MoO3 and Ag electrodes. Stability tests were conducted under dark, thermal stress, and ambient conditions.
5：Data Analysis Methods:
Performance parameters (Voc, Jsc, FF, PCE) were extracted from J-V curves. Charge carrier transport and recombination were analyzed using light intensity dependence and space charge limited current (SCLC) methods. Morphological and electronic properties were characterized using AFM, Raman, GIWAXS, and UPS.
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