研究目的
To alleviate the problems of long-term stability and nonradiative recombination in perovskite solar cells by introducing a dopant-free hole-transporting material (HTM) based on a donor-acceptor polymer, PBT1-C.
研究成果
The study introduced a dopant-free HTM based on a donor-acceptor polymer, PBT1-C, which not only possesses excellent hole mobility but is also able to passivate the surface traps of the perovskite films. The derived PVSC shows a high power conversion efficiency of 19.06% with a very high fill factor of 81.22%, which is the highest reported for dopant-free polymeric HTMs. The results validate that PBT1-C can effectively passivate both surface and grain boundary traps of the perovskite.
研究不足
The study does not mention any specific limitations.
1：Experimental Design and Method Selection:
The study introduced a dopant-free HTM based on a donor-acceptor polymer, PBT1-C, synthesized from the copolymerization between benzodithiophene and 1,3-bis(4-(2-ethylhexyl)thiophen-2-yl)-5,7-bis(2-alkyl)benzo[1,2-c:4,5-c′]dithiophene-4,8-dione units.
2：Sample Selection and Data Sources:
Perovskite films were used as samples.
3：List of Experimental Equipment and Materials:
UV–vis absorption spectra, electrochemical cyclic voltammetry, space-charge-limited-current (SCLC) measurement, Fourier Transform infrared spectroscopy (FTIR), steady-state photoluminescence (PL), time-resolved photoluminescence (TRPL), grazing-incidence wide-angle X-ray scattering (GIWAXS), atom force microscopy (AFM), electrochemical impedance spectroscopy (EIS).
4：Experimental Procedures and Operational Workflow:
The optical and electrochemical properties of PBT1-C and P3HT were investigated. The photovoltaic performance of PVSCs based on different HTMs was measured under AM
5：5 G illumination at 100 mW cm?Data Analysis Methods:
The PL lifetime of fabricated films was fitted by a two-component exponential decay model. The energetic profile of tDOS was deduced from the angular frequency (ω) dependent capacitance.
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