研究目的
To demonstrate that introducing a small amount of fullerene or nonfullerene acceptors as filler into the photoactive layer of PBDBT:N2200 all-PSCs can enhance charge transport properties, thereby improving the device performance.
研究成果
The study successfully demonstrates that introducing small molecules as acceptors and fillers in all-PSCs can improve device performance without sacrificing stability. The optimal PCE value of 7.42% was achieved with PBDBT:N2200:PC71BM blend, showing enhanced exciton separation, reduced charge recombination, and balanced charge transport. This approach provides a design route for developing mechanically stable and high-performance solar cells.
研究不足
The study focuses on the impact of fullerene and nonfullerene acceptors as fillers on the performance of all-PSCs. Limitations include the specific materials used (PBDBT, N2200, PC71BM, ITIC) and the conditions under which the devices were tested. Potential areas for optimization include exploring other filler materials and further understanding the filler's role in charge transport and recombination.
1：Experimental Design and Method Selection:
The study involves the fabrication of all-polymer solar cells (all-PSCs) with the introduction of fullerene or nonfullerene acceptors as fillers into the photoactive layer. The methodology includes the preparation of materials, device fabrication, and characterization techniques such as current density–voltage (J–V) characteristics, incident-photon-conversion-efficiency (IPCE) spectra, photoluminescence spectra, and grazing-incidence wide-angle X-ray scattering (GIWAXS).
2：Sample Selection and Data Sources:
The samples include PBDBT:N2200 all-PSCs with various amounts of PC71BM or ITIC as fillers. Data sources include optical measurements, charge transport properties, and film morphology studies.
3：List of Experimental Equipment and Materials:
Materials include PBDBT, N2200, PC71BM, and ITIC. Equipment includes a Keithley Model 2400 source meter, a calibrated solar simulator, a spectrometer, and GIWAXS measurement setup.
4：Experimental Procedures and Operational Workflow:
The procedure involves the preparation of photoactive layers with varying amounts of fillers, device fabrication, and performance evaluation under simulated solar light.
5：Data Analysis Methods:
Data analysis includes the evaluation of charge transport properties, exciton dissociation efficiency, and film morphology to understand the impact of fillers on device performance.
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