研究目的
Investigating the influence of the acceptor crystallinity on the open-circuit voltage in PTB7-Th: ITIC organic solar cells.
研究成果
The crystallinity of the active layer can affect the VOC of the devices through the energy of the CT states in non-fullerene organic solar cells. The study provides insights into the optimization of device performance by tuning the crystallinity of the active layers.
研究不足
The study focuses on the PTB7-Th: ITIC system and may not be directly applicable to other organic solar cell systems. The influence of other factors on VOC, such as carrier density and energetic disorder, is not fully explored.
1：Experimental Design and Method Selection:
The study uses various investigation methods including AFM, GIWAXS, and EL spectrometry to analyze the influence of solution properties on the morphology and device performance of OSCs.
2：Sample Selection and Data Sources:
PTB7-Th and ITIC were purchased from 1-Materials, Canada, and Solarmer Incorporation, USA, respectively. The solvents CB, CF, and DIO were purchased from Sigma-Aldrich.
3：List of Experimental Equipment and Materials:
Atomic force microscope (AFM), grazing incident wide-angle X-ray scattering (GIWAXS), Electroluminescence (EL) Spectrometry, Keithley 2400 source measurement unit, AM
4：5G simulated sunlight, calibrated spectrometer (QE Pro, Ocean Optics). Experimental Procedures and Operational Workflow:
The devices were fabricated on pre-clean prepatterned ZnO/ITO/glass substrates by spin-casting the solutions in nitrogen atmosphere glove boxes. The top electrode was deposited by thermal evaporation.
5：Data Analysis Methods:
The current–voltage (J–V) characteristic was measured under AM 1.5G simulated sunlight. The EL spectrometry was determined by measuring the emitted photons of devices through an integrated sphere.
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