Publication date: 5th November 2025
Carbon nanotubes (CNTs) offer tunable bandgaps, adjustable metallic or semiconducting behavior, flexibility, and renewability, making them strong candidates to replace conventional transparent electrodes such as Indium Tin Oxide (ITO). This work demonstrates the use of spray-coated CNT films as bottom electrodes in inverted OSCs. [1-4]
In this study, inverted OSCs were developed using spray-coated n-doped single-walled carbon nanotube (SWCNT) transparent electrodes. PV-D4610 and PC61BM were selected as the donor and acceptor materials. As a reference, inverted devices with ITO bottom electrodes were first optimized, outputting a PCE of 6.97%. Based on this structure, SWCNTs from MEIJO eDIPS ink were spray-coated onto glass and subsequently doped to tune their semiconducting behavior and conductivity. The resulting inverted OSC employing SWCNTs as the transparent bottom electrode achieved a PCE of 2.84%.
Overall, this work investigates the potential of CNTs as alternatives to traditional electrodes and provides practical guidance for their implementation in OSC designs.
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