研究目的
To improve the efficiency and stability of inverted perovskite solar cells by modifying the hole transport layer (HTL) with copper(I) thiocyanate (CuSCN) doped in poly(ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS).
研究成果
The doping of CuSCN in PEDOT:PSS HTLs significantly enhances the PCE and improves the long-term stability of inverted PSCs. The PEDOT:PSS-CuSCN composite film exhibits lower acidity and higher work function, beneficial for stability and charge extraction efficiency. The crystallization of the perovskite film is also promoted, leading to increased grain sizes and reduced boundaries. The optimized PSCs show improved PCEs up to 15.3%, 16% higher than the control device, and exhibit high long-term stability.
研究不足
The study does not address the scalability of the fabrication process for large-scale production or the long-term stability under outdoor conditions. Additionally, the effect of CuSCN doping concentration beyond 6 vol% was not explored.
1：Experimental Design and Method Selection:
The study proposed a new HTL modification method using CuSCN NH3 [aq] solution doped into PEDOT:PSS, followed by low-temperature annealing.
2：Sample Selection and Data Sources:
The samples were inverted PSCs with a structure of ITO/PEDOT:PSS-CuSCN/MAPbI3/PCBM/C60/LiF/Al.
3：List of Experimental Equipment and Materials:
The materials used include PEDOT:PSS, CuSCN, MAPbI3, PCBM, C60, LiF, and Al. The equipment includes spin-coating setup, thermal treatment setup, and characterization tools like AFM, XPS, UV absorption spectra, XRD, SEM, EDX, CV tests, and IS measurements.
4：Experimental Procedures and Operational Workflow:
The PEDOT:PSS-CuSCN composite layer was prepared by doping CuSCN NH3 [aq] solution into PEDOT:PSS, spin-coated on ITO substrates, and heated at 120°C for 20 min. The perovskite layer was then deposited, followed by the electron transport layer and metal electrode.
5：Data Analysis Methods:
The performance of the PSCs was evaluated through J-V curves, EQE spectra, steady-state PL spectra, time-resolved PL decay profiles, light-intensity dependent J-V measurements, and IS measurements.
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