研究目的
Investigating the performance enhancement of ternary organic solar cells (OSCs) through the addition of a small molecule (SM) to a binary blend of conjugated polymer and non-fullerene acceptor, focusing on the impact on molecular ordering, crystallinity, and overall device efficiency.
研究成果
The study demonstrates that the addition of p-DTS(FBTTh2)2 SM to PTB7-Th: IEICO-4F binary blend significantly enhances the PCE of ternary OSCs. The improved performance is attributed to enhanced molecular ordering, crystallinity, and reduced charge recombination. The findings provide insights into the design of high-efficiency ternary OSCs.
研究不足
The study focuses on a specific ternary blend system, and the findings may not be directly applicable to other material systems. The optimization of the ternary blend composition is crucial, and deviations from the optimal ratio can lead to reduced performance.
1：Experimental Design and Method Selection:
The study involves the fabrication of ternary organic solar cells (OSCs) using PTB7-Th and p-DTS(FBTTh2)2 as donors and IEICO-4F as an acceptor. The methodology includes the preparation of binary and ternary blends with varying ratios of p-DTS(FBTTh2)2, followed by device fabrication in an inverted geometry.
2：Sample Selection and Data Sources:
The photoactive layers were prepared using PTB7-Th, p-DTS(FBTTh2)2, and IEICO-4F, purchased from Solarmer. The blends were prepared in chlorobenzene with 0.5 vol% of 1,8 diiodooctane (DIO).
3：5 vol% of 1,8 diiodooctane (DIO). List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Devices were fabricated using ITO/ZnO (40 nm)/photoactive layer (100 nm)/MoO3 (10 nm)/Al (100 nm) architecture. Characterization techniques included J-V measurements, EQE spectra, PL spectra, AFM, and GIWAXS.
4：Experimental Procedures and Operational Workflow:
The photoactive blend was spin-coated inside a nitrogen-filled glove box. Devices were characterized under AM 1.5 G illumination, and morphological studies were conducted using AFM and GIWAXS.
5：5 G illumination, and morphological studies were conducted using AFM and GIWAXS. Data Analysis Methods:
5. Data Analysis Methods: The study analyzed recombination kinetics, charge carrier dynamics, and morphological properties to understand the mechanism behind the enhanced performance of ternary OSCs.
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Keithley 2600 source meter
2600
Keithley
Measurement of current density-voltage (J-V) characteristics
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C-3000, Nanosurf, Inc.
C-3000
Nanosurf
Morphological studies using scanning probe microscope
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UV-2450, Shimadzu Corporation
UV-2450
Shimadzu
Recording of absorption spectra
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Hitachi f-7000
f-7000
Hitachi
Recording of photoluminescence (PL) spectra
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PTB7-Th
Solarmer
Donor polymer in the ternary organic solar cells
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p-DTS(FBTTh2)2
Solarmer
Small molecule donor in the ternary organic solar cells
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IEICO-4F
Solarmer
Non-fullerene acceptor in the ternary organic solar cells
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1,8 diiodooctane (DIO)
Additive in the photoactive blend preparation
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ITO
Substrate for device fabrication
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ZnO
Electron transport layer in the device architecture
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MoO3
Hole-collecting layer in the device architecture
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Al
Anode in the device architecture
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CEP-25ML Spectral Response Measurement System
CEP-25ML
Measurement of external quantum efficiency (EQE) spectra
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ZIVE SP1 electrochemical workstation
SP1
ZIVE
Electrochemical impedance spectroscopy (EIS) measurements
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Stanford Synchrotron Radiation Lightsource (SSRL) beamline 11-3
11-3
SSRL
Grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements
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Rayonix MX225 X-ray detector
MX225
Rayonix
Recording of GIWAXS spectra
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