研究目的
Investigating the newly designed asymmetric chromophore for power conversion efficiency improvements in organic solar cells.
研究成果
The novel asymmetric D1-π-A-D2, OMe-BBTz, was synthesized and extensively used as donor material for the fabrication of BHJ-OSCs. The π-spacer in OMe-BBTz chromophore appreciably improved the structural, thermal, electronic levels and photovoltaic properties. The enhanced PCE of ~3.53% was achieved with OMe-BBTz:PC61BM (1:3,w/w) active layer, which might be related to lower-lying HOMO energy level, higher absorption coefficient and more balanced charge mobility. This study provides meaningful insights into the structure-property relationships of organic chromophores with tunable optoelectronic properties for the successful applications of BHJ-OSCs.
研究不足
The study focuses on the synthesis and characterization of a novel chromophore and its application in BHJ-OSCs, but does not explore the long-term stability or scalability of the solar cells.
1：Experimental Design and Method Selection:
The synthesis of OMe-BBTz chromophore involved several intermediate steps, using 2,1,3-benzothiadiazole as an acceptor with dimethoxyphenyl and hexyl bithiophene as donor units.
2：Sample Selection and Data Sources:
All reagents, chemicals and the starting materials were purchased from commercial sources.
3：List of Experimental Equipment and Materials:
Thermogravimetric analysis (TGA, TA instruments Q-50 thermogravimetry analyzer), differential scanning calorimetry (DSC, TA instrument DSC-2910), ultraviolet-visible (UV-Vis, JASCO, V-670, Japan), room temperature photoluminescence (PL, FP-6500, JASCO), cyclic voltammetry (CV, WPG-100 Potentiostat/Galvanostat, WonATech), atomic force microscopic (AFM, Nanoscope IV, Digital Instruments, Santa Barbara, USA), time-resolved photoluminescence (TRPL, iHR320, TSCPC).
4：Experimental Procedures and Operational Workflow:
The reaction mixture was flushed with N2 for 20 min, followed by the addition of Pd(PPh3)4 (5 mol%), and then stirred at 100oC for 24h under an inert atmosphere. The residue was purified by column chromatography on silica gel with hexane:DCM (1:1,v:v) and then recrystallized with dichloromethane/methanol (2/1).
5：1). Data Analysis Methods:
5. Data Analysis Methods: The optical band gap (Eg opt) of OMe-BBTz was calculated using the onset value of absorption band. The HOMO and LUMO levels were estimated from the cyclic voltammetry measurements.
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