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Hole transfer dynamics between CsPbBr3 PNCs and p-phenylene diisothiocyanate
Sourav Mandal1, Subhadip Giri1, Suraj Barman1
1Department of Chemistry, Vidyasagar University, West Bengal 721102, India. ajay@mail.vidyasagar.ac.in.
Physical Chemistry Chemical Physics : PCCP
|January 30, 2026
Summary
This study explores charge transfer in cesium lead bromide perovskite nanocrystals using p-phenylene diisothiocyanate. We observed a maximum transfer efficiency of 57%, highlighting the importance of excitation energy for photovoltaic applications.
Area of Science:
- Materials Science
- Photovoltaics
- Nanotechnology
Background:
- Lead halide perovskites are promising for solar energy.
- Efficient charge separation and transfer are crucial for photovoltaic efficiency.
- Identifying suitable electron/hole acceptors is an active research area.
Purpose of the Study:
- To investigate charge transfer dynamics between cesium lead bromide perovskite nanocrystals (PNCs) and p-phenylene diisothiocyanate (PDNCS).
- To understand the influence of excitation energy on transfer efficiency and photoluminescence quantum yield (PLQY).
Main Methods:
- UV-Vis absorption spectroscopy
- Steady-state and time-resolved photoluminescence (PL) spectroscopy
- Femtosecond transient absorption spectroscopy (TAS) at varying excitation powers
Main Results:
- Maximum charge transfer efficiency of approximately 57% was achieved at ~1.39Eg excitation energy.
- Photoluminescence quantum yield (PLQY) showed strong dependence on excitation wavelength.
- Higher hole transfer efficacy at high energy excitation led to lower PLQY.
Conclusions:
- PDNCS acts as an effective acceptor for charge transfer with CsPbBr3 PNCs.
- Excitation energy significantly impacts charge transfer efficiency and PLQY.
- Understanding these dynamics is key for optimizing perovskite solar cell performance.
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