With comparable compositions on both sides, comparatively weak electric field is established within T-TENG and leading in reduced overall output performance. The investigation further explored optimising the performance of T-TENG by exploring the potential impact of tribo-layer thickness. Varied thicknesses of insulator-coating materials (tribo-layer) were examined, revealing an optimal thickness of approximately 57µm. Intriguingly, further increases in thickness led to a decline in T-TENG performance (Figure ). This phenomenon is attributed to surpassing an optimum thickness, resulting in a reduction in charge density. The performance of TENGs relies significantly on the distance or space between tribo-layers.