Analysis of AC Response and Charge Transport Mechanisms in Double-Layer and Triple-Layer Solar Cell Architectures
This work investigates the effect of the ruthenium dye (Ru -dye) layer on electrical properties of solar cells based on the nc-TiO₂ semiconducting polymer heterojunction. In TLSCs (P3HT/Ru-dye/nc-TiO2 solar cells), when the measurement frequency is decreased from 10 Hz to 0.1 Hz, a three-orders-...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
V.N. Karazin Kharkiv National University Publishing
2025-06-01
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| Series: | East European Journal of Physics |
| Subjects: | |
| Online Access: | https://periodicals.karazin.ua/eejp/article/view/25803 |
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| Summary: | This work investigates the effect of the ruthenium dye (Ru -dye) layer on electrical properties of solar cells based on the nc-TiO₂ semiconducting polymer heterojunction. In TLSCs (P3HT/Ru-dye/nc-TiO2 solar cells), when the measurement frequency is decreased from 10 Hz to 0.1 Hz, a three-orders-of-magnitude increase in capacitance is observed. It is attributed to the dominance of diffusion capacitance the meauremnts , which indicates enhanced charge carrier dynamics and contribut to better performance and improved efficiency. In contrast, in the same frequency range, DLSCs (P3HT/nc-TiO2 solar cells) exhibits a one-order-of-magnitude increase in capacitance, ascribed to the dominance of depletion capacitance. Thus, DLSCs likely suffer from low carrier injection, high recombination losses, and ultimately lower efficiency. The Cole-Cole curves are plotted for applied voltages ranging from 0 to 1.5 V and frequencies from 20 Hz to 1 MHz. At zero bias, while there is evidence of a relaxation process in TLSCs, this is not as clear for DLSCs. This is realted to the effect of the Ru-dye inserted between the P3HT and nc-TiO₂ layers (TLSC), which facilitates better charge carrier generation and transport. |
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| ISSN: | 2312-4334 2312-4539 |