Fig. 21.
a Graphical representation of fiber-shaped SCs in series, b relationship between voltage on charging time. Reprinted with permission from Ref. [235]. c Pictorial demonstration of the structure of coaxially integrated photovoltaic device, along with cross-sectional views, d a standard photocharging and discharging of SC, relationship between voltage and storage efficiency on the solar charging time during charging and discharging process. Reprinted with permission from Ref. [236]
