研究目的
Investigating the relationship between conformation shapes of asymmetric small molecular acceptors (SMAs) and polymer solar cells (PSCs) efficiencies.
研究成果
The S-shape IDTP-4F-based PSCs performed obviously better than their counterparts using IDTTP-4F, regardless of the polymer donors, which confirms that S-shape conformation performs better than the C-shape conformation. Among all the binary systems, PM7:IDTP-4F realized the champion PCE of 15.2%, which is a remarkable achievement for reaching an efficiency over 15% in the absence of the Y6 and derivative systems.
研究不足
The study focuses on the relationship between conformation shapes of asymmetric SMAs and PSC efficiencies, but the universality of this relationship across different types of polymer donors and SMAs needs further investigation.
1：Experimental Design and Method Selection:
Designed two hepta-ring and octa-ring asymmetric SMAs (IDTP-4F and IDTTP-4F) with S-shape and C-shape confirmations to study the relationship between conformation shapes and PSC efficiencies. Three wide-bandgap polymer donors (PM6, S1, and PM7) were chosen to prove the universality of the relationship between conformation and photovoltaic performance.
2：Sample Selection and Data Sources:
The SMAs were synthesized and characterized by 1H NMR, 13C NMR, and MALDI-TOF MS. The molecular geometries were investigated using density functional theory (DFT).
3：List of Experimental Equipment and Materials:
UV–vis absorption spectra were measured. Atomic force microscopy (AFM), transmission electron microscopy (TEM), the grazing incidence wide-angle X-ray scattering (GIWAXS), and resonant soft X-ray scattering (RSoXS) were carried out to gain deep insights into the morphology.
4：Experimental Procedures and Operational Workflow:
A series of PSCs based on PM6:IDTP-4F, PM6:IDTTP-4F, S1:IDTP-4F, S1:IDTTP-4F, PM7:IDTP-4F, and PM7:IDTTP-4F are fabricated with the conventional structure of indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene):poly(styrene- sulfonate) (PEDOT:PSS)/active layer/PNDIT-F3N/Ag.
5：Data Analysis Methods:
The characteristic current density–voltage (J–V) curves of best-performing PSCs and the corresponding external quantum efficiency (EQE) spectra were depicted. Space charge limited current (SCLC) method was applied to evaluate charge-carrier mobilities.
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IDTP-4F
Small molecular acceptor with S-shape conformation for polymer solar cells
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IDTTP-4F
Small molecular acceptor with C-shape conformation for polymer solar cells
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PM6
Polymer donor for polymer solar cells
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S1
Polymer donor for polymer solar cells
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PM7
Polymer donor for polymer solar cells
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PEDOT:PSS
Conductive polymer used in the conventional structure of PSCs
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PNDIT-F3N
Used in the conventional structure of PSCs
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Ag
Electrode material in PSCs
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