Abstract
Semi-transparent organic solar cells (ST-OSCs) have attracted significant research attention, as they have strong potential to be applied in automobiles and buildings. For ST-OSCs, the transparent top electrode is an indispensable component, where the dielectric/metal/dielectric (D/M/D) structured electrode displayed a promising future due to its simplicity in the fabrication. In this work, by using the MoO3-/Ag-/MoO3-based D/M/D transparent electrode, we fabricated ST-OSCs based on the PM6:N3 active layer for the first time. In the device fabrication, the D/M/D transparent electrode was optimised by varying the thickness of the outer MoO3 layer. As a result, we found that increasing the thickness of the outer MoO3 layer can increase the average visible transmittance (AVT) but decrease the power conversion efficiency (PCE) of the device. The outer MoO3 layer with a 10 nm thickness was found as the optimum case, where its corresponding device showed the PCE of 9.18% with a high AVT of 28.94%. Moreover, the colour perception of fabricated ST-OSCs was investigated. All semi-transparent devices exhibited a neutral colour perception with a high colour rendering index (CRI) over 90, showing great potential for the window application.
Highlights
Organic solar cells (OSCs) have the benefits of inexpensive fabrication, flexibility, lightweight, and nature of semitransparency [1,2,3]
We found that increasing the thickness of the outer MoO3 layer can increase the average visible transmittance (AVT) but decrease the power conversion efficiency (PCE) of the device
The ITO, a 40 nm thickness of the ZnO sol-gel layer works as an electron transport layer (ETL)
Summary
Organic solar cells (OSCs) have the benefits of inexpensive fabrication, flexibility, lightweight, and nature of semitransparency [1,2,3]. Since the chlorophylls only function in a small range of the light spectrum, ST-OSCs can be tuned to highly transparent over the spectrum essential for the plant growth while producing power using the rest during the device fabrication [13,16]. For these applications of ST-OSCs, decent transparency under the visible spectrum plays a vital role, and 25% of average visible transmittance (AVT) is a generally acceptable transmittance for window applications [10]. All the devices displayed a neutral colour perception with a high CRI value over 90
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