Abstract
We demonstrate highly efficient energy harvesting devices for dim-light application under 200 lux irradiation using dye-sensitized solar cells (DSCs) and perovskite solar cells (PSCs). The high-efficiency DSCs are composed of cobalt-based redox mediators in 3-methoxypropionitrile (MPN) solvent with MK-2 sensitizer. With the introduction of under layer treatment and fine-tuning of compositions in cobalt-based electrolyte, the power conversion efficiency of cobalt-based DSCs achieves 16.0% under 200 lux illumination. That outperforms the best device using the conventional iodine-based electrolyte illuminated with the same light intensity. Especially, cobalt-based electrolyte system exhibits a higher open circuit voltage than iodine-based electrolyte counterpart. We also investigate perovskite solar cells under dim-light condition. PSCs show higher open circuit voltage and short circuit current density than DSCs with efficiency up to 23.4%. In this work, our results demonstrate the promising potential of DSCs and PSCs in the dim-light applications.
Highlights
The development of energy harvesting devices for Internet of Things (IOTs) application is considered an important aspect to realize self-sustained operation
Omata et al reported that the ruthenium dyes were not suitable in cobalt-based electrolyte system
They attributed the effects to the extra recombination channel (Omata et al, 2015) which resulted from the interaction of the Co redox with the Ru dye
Summary
The development of energy harvesting devices for Internet of Things (IOTs) application is considered an important aspect to realize self-sustained operation. Dye-sensitized Solar Cell (DSC), one of the emerging photovoltaic (PV) techniques, has several advantages such as being colorful, flexible, and having a relatively low fabrication cost. It is regarded as the generation PV technology to compete with conventional inorganic solar cells in the aforementioned unique aspects. The other rising photovoltaic devices, perovskite solar cells, receive tremendous attention due to their high efficiency with low Photovoltaic Application Under Dim-Light cost fabrication processes (Zhao et al, 2017). Studies of their performances under low light are emerging since encouraging pioneering work done by Chen et al They demonstrated inverted-type PSCs with the efficiency over 20% under dim-light condition (Chen et al, 2015)
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