LAUSR

Bifacial Dye-Sensitized Solar cells (DSSCs) are regarded as promising solar energy conversion devices with high efficiency and less resource consumption. In this work, a highly transparent and efficient counter electrode (CE) is fabricated by introducing highly-dispersed single Pt atoms doping into van der Waals layer-by-layer (lbl) epitaxial growth of Zn-TCPP thin film (Zn-TCPP-Pt). The resulted Zn-TCPP-Pt CE has similar catalytic activity to commercial Pt CE, but show a better light transmission capacity in the range of visible light. The bifacial DSSC with Zn-TCPP-Pt thin film CE achieves high power con-version efficiency (PCE) of 5.48% and 4.88% under front-side and rear-side irradiations, respectively. With maximized atomic efficiency, excellent performance was obtained with about 1% Pt content and highly-transparent CEs. Therefore, the light energy resource utilization rate of such less Pt and transpar-ence CE is greatly improved in bifacial dye-sensitized solar cells, making it a promising candidate to replace Pt CE.