Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.229
Publication date: 18th December 2023
Planner hetero-junction (PHJ) structure is one of the key device fabrication strategies to increase specific detectivity by reducing dark current in organic photodiodes (OPDs). We demonstrated that efficient free charge generation in partially chlorinated subphthalocyanine molecules (Cl6-SubPc) can assist PHJ OPDs to achieve detectivity up to 1013 Jones and dark current below 10-7 A cm-2 up to -5 V. The photophysical analysis of Cl6-SubPc based devices clearly show that device photocurrent is primarily generated through direct charge generation within the Cl6-SubPc layer, rather than exciton separation at layer interfaces. Molecular modelling suggests that direct charge generation is facilitated by Cl6-SubPc’s high octupole moment which generates a shift in molecular energetics [1,2] (Fig(1(a)). Also, lower trap densities analysed from capacitance-frequency response [3] in thick PHJ device helps in further minimising leakage currents as shown in Fig(1(b)). In summary, this study provides clear indication that Cl6-SubPc is promising material for single component OPD devices.
We thank Samsung Electronics for the project funding and the UK EPSRC for ATIP program grant (EP/T028513/1) and Centre for Doctoral Training in Plastic Electronics (EP/L016702/1).
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