Abstract
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.