@article { , title = {Achieving high open circuit voltage for hole transport layer free ambient perovskite solar cells utilizing electric double layer effect}, 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.}, doi = {10.1016/j.solmat.2022.112148}, issn = {0927-0248}, journal = {Solar Energy Materials and Solar Cells}, publicationstatus = {Published}, publisher = {Elsevier}, volume = {251}, keyword = {Perovskite, Solar cell, Electric double layer, Carbon electrode}, year = {2023}, author = {Sadhukhan, Priyabrata and Roy, Anurag and Bhandari, Shubhranshu and Mallick, Tapas K. and Das, Sachindranath and Sundaram, Senthilarasu} }