研究目的
To investigate the voltage loss in triplet material-based organic photovoltaic devices (T-OPVs) by synthesizing two homoleptic iridium(III) complexes and studying their performance when mixed with an electron acceptor.
研究成果
The study concluded that the higher Voc observed in Ir(FOtbpa)3-based devices compared to Ir(Ftbpa)3-based devices is attributed to reduced radiative and non-radiative recombination losses. The insertion of oxygen-bridges as flexible inert d-spacers in Ir(FOtbpa)3 contributed to this improvement.
研究不足
The study is limited to the specific Ir complexes and PC71BM acceptor used, and the findings may not be generalizable to other materials. Additionally, the impact of morphology on device performance was excluded, which could be a factor in other systems.
1：Experimental Design and Method Selection:
The study involved the synthesis of two homoleptic iridium(III) complexes, Ir(Ftbpa)3 and Ir(FOtbpa)3, and their use as electron donors in T-OPVs with PC71BM as the electron acceptor. The methodology included UV-vis absorption spectra, photoluminescence (PL) and electroluminescence (EL) spectra measurements, and device fabrication and characterization.
2：Sample Selection and Data Sources:
The samples were the synthesized Ir complexes and their blends with PC71BM. Data sources included UV-vis absorption spectra, PL and EL spectra, and device performance metrics.
3：List of Experimental Equipment and Materials:
Equipment included a PerkinElmer Lambda 900 spectrometer for UV-vis absorption spectra, an Andor spectrometer for PL and EL spectra, and a Keithley 2400 Source Meter for device characterization. Materials included the synthesized Ir complexes and PC71BM.
4：Experimental Procedures and Operational Workflow:
The procedure involved synthesizing the Ir complexes, fabricating the T-OPVs, and characterizing their performance through various spectroscopic and electrical measurements.
5：Data Analysis Methods:
Data analysis involved fitting the FTPS-EQE spectra according to Marcus theory and calculating the radiative and non-radiative recombination losses.
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