Semitransparent Solar Cells Employing n-Type Graphene on LaVO(3)

[Image: see text] To effectively utilize solar energy, semitransparent solar cells are essential in various fields such as building-integrated solar power generation and portable solar chargers. We report triethylenetetramine (TETA)-doped graphene (Gr) transparent conductive electrode (TCE)-based LaVO(3) semitransparent solar cells. To optimize the Gr TCE, we varied the TETA molar concentration (n(D)) from 0.1 to 0.3 mM. TETA-doped Gr (TETA-Gr)/LaVO(3) semitransparent solar cells exhibit the highest 1.45% efficiency and 62% average visible transmittance at n(D) = 0.2 mM. These results indicate that the TETA-Gr/LaVO(3) structure not only harvests solar energy in the ultraviolet–visible region but also exhibits translucency, thanks to the thin film. Thanks to its translucent properties, we improved the power conversion efficiency (PCE) to 1.99% by adding an Al reflective mirror to the semitransparent cells. Finally, the device’s PCE loss is only within 3% for 3000 h in air, suggesting good durability.