Impedance spectroscopy of Sb<sub>2</sub>Se<sub>3</sub> photovoltaics consisting of (Sb<sub>4</sub>Se<sub>6</sub>)<sub><i>n</i></sub> nanoribbons under light illumination.



Park, Jaemin, Shalvey, Thomas P, Moehl, Thomas, Woo, Kyoohee ORCID: 0000-0002-5534-9475, Major, Jonathan D, Tilley, S David and Yang, Wooseok ORCID: 0000-0001-8750-5682
(2023) Impedance spectroscopy of Sb<sub>2</sub>Se<sub>3</sub> photovoltaics consisting of (Sb<sub>4</sub>Se<sub>6</sub>)<sub><i>n</i></sub> nanoribbons under light illumination. Nanoscale, 15 (48). pp. 19757-19766.

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Abstract

Sb<sub>2</sub>Se<sub>3</sub>, consisting of one-dimensional (Sb<sub>4</sub>Se<sub>6</sub>)<sub><i>n</i></sub> nanoribbons has drawn attention as an intriguing light absorber from the photovoltaics (PVs) research community. However, further research is required on the performance-limiting factors in Sb<sub>2</sub>Se<sub>3</sub> PVs. In this study, we investigated the charge carrier behavior in Sb<sub>2</sub>Se<sub>3</sub> PVs by impedance spectroscopy (IS) under light illumination. (Sb<sub>4</sub>Se<sub>6</sub>)<sub><i>n</i></sub> nanoribbons with two different orientations were used to investigate the effect of crystal orientation on the device performance. Regardless of the (Sb<sub>4</sub>Se<sub>6</sub>)<sub><i>n</i></sub> orientation, negative capacitance was observed at forward bias, representing a recombination pathway at the TiO<sub>2</sub>/Sb<sub>2</sub>Se<sub>3</sub> interface. A comparison of the recombination resistances and lifetimes of two different Sb<sub>2</sub>Se<sub>3</sub> PVs showed that a better interface could be formed by placing the (Sb<sub>4</sub>Se<sub>6</sub>)<sub><i>n</i></sub> ribbons parallel to the TiO<sub>2</sub> layer. Based on these observations, an ideal structure of the Sb<sub>2</sub>Se<sub>3</sub>/TiO<sub>2</sub> interface is proposed, which will enhance the performance of Sb<sub>2</sub>Se<sub>3</sub> PVs toward its theoretical limit.

Item Type: Article
Uncontrolled Keywords: 40 Engineering, 4018 Nanotechnology
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 15 Dec 2023 11:32
Last Modified: 20 Jun 2024 23:49
DOI: 10.1039/d3nr04082h
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3177407