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Achieving high open circuit voltage for hole transport layer free ambient perovskite solar cells utilizing electric double layer effect

Sadhukhan, Priyabrata; Roy, Anurag; Bhandari, Shubhranshu; Mallick, Tapas K.; Das, Sachindranath; Sundaram, Senthilarasu

Authors

Priyabrata Sadhukhan

Anurag Roy

Shubhranshu Bhandari

Tapas K. Mallick

Sachindranath Das



Abstract

One of the features of perovskite solar cells (PSCs) that make them stand out among all photovoltaics (PVs) is their high open-circuit voltage (VOC). Owing to their simple manufacturing process, low cost of components, and good stability, carbon electrode-based metal-halide PSCs are gaining interest for their better stability and low cost than noble metal electrodes. However, carbon electrode-based hybrid PSCs suffer low open-circuit voltage (VOC). This work demonstrated the fabrication of ambient processed hybrid perovskite solar cells using low-temperature curable carbon-based electrodes without a hole transport layer. The devices exhibit an impressive high open circuit voltage of 1.07 V, even without a dedicated hole transport layer. The photovoltaic performance was further investigated with the same perovskite absorber, synthesized by solution-processed and solid-state synthesis routes. The latter have yielded better short circuit current and power conversion efficiency due to perovskite's lesser built-in trap density. Furthermore, using a combined ionic electronic carrier transport model, an electric double-layer formation was ensured across the perovskite/carbon interface and accumulating halide vacancies at the perovskite/TiO2 interface can effectively reduce carrier recombination and boost the device's VOC. This study envisages the impact of the electric double layer in free carrier transport of an ionic-electronic semiconductor like hybrid perovskites and can pave the way to improve the open-circuit voltage of carbon-based perovskite solar cells.

Journal Article Type Article
Acceptance Date Dec 4, 2022
Online Publication Date Dec 8, 2022
Publication Date 2023-03
Deposit Date Jan 26, 2023
Journal Solar Energy Materials and Solar Cells
Print ISSN 0927-0248
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 251
Article Number 112148
DOI https://doi.org/10.1016/j.solmat.2022.112148
Keywords Perovskite, Solar cell, Electric double layer, Carbon electrode