A highly efficient self-power pack system integrating supercapacitors and photovoltaics with an area-saving monolithic architecture
- A highly efficient self-power pack system integrating supercapacitors and photovoltaics with an area-saving monolithic architecture
- 김정환; Sun Min Lee; Yun-Hwa Hwang; Seongyu Lee; Byoungwook Park; Jae-Hyung Jang; Kwanghee Lee
- Issue Date
- Journal of materials chemistry. A, Materials for energy and sustainability
- VOL 5, NO 5-1912
- Self-charging power packs (SPPs), integrating both a solar cell and energy storage capacitor (EC) into a single device, are very promising energy systems due to their multiple functions of energy harvesting and storage. Despite their promising potential, however, the monolithic stacking of solid-state ECs onto a large-area solar cell without any external wires is one of the crucial challenges. Here, we successfully demonstrate compact and monolithically stacked SPPs combining a polyvinyl alcohol (PVA)/phosphoric acid (H3PO4)-based solid-state supercapacitor and an organometal halide perovskite-or polymer-based solar cell (PeSC or PSC). As a result of robust interconnection formed via a novel electric glue and efficient solar cells with an enlarged photo-harvesting area of up to 100 mm(2), the SPPs exhibited a very high storage efficiency (eta(storage)) and overall efficiency (eta(overall)) of 80.31% and 10.97%, respectively, for the PeSC-supercapacitor power pack, and 64.59% and 5.07%, respectively, for the PSC-supercapacitor power pack. To the best of our knowledge, the eta(overall) value of our PeSC-supercapacitor power pack is by far the highest reported efficiency for integrated self-charging power packs.
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