Two-Dimensional Graphitic Carbon Nitride for Improving the Performance of Organic Solar Cells.

ABSTRACT

Organic solar cells (OSCs) have attracted lots of attention owing to their low cost, lightweight, and flexibility properties. Nowadays, the performance of OSCs is continuously improving with the development of active layer materials. However, the traditional hole transport layer (HTL) material Poly(3,4-ethylenedioxythiophene)poly(styrenesulfonate) (PEDOTPSS) presents insufficient conductivity and rapid degradation, which decreases the efficiency and stability of OSCs. To conquer the challenge, the two-dimensional (2D) graphitic carbon nitride (g-C3N4) nanomaterials incorporated into the PEDOTPSS as hybrid HTL are reported. The addition of g-C3N4 into PEDOTPSS enables the thickness of the HTL to decrease for enhancing the transmittance of the film and increase the conductivity of PEDOTPSS. Thus, the device exhibts improved charge transport and suppressed carrier recombination, leading to the increase in short-circuit current density and power conversion efficiency of the devices. This work demonstrates that the incorporation of 2D g-C3N4 into PEDOTPSS for D18Y6 and PM6L8-BO-based OSCs can significantly improve the device efficiency to 17.48% and 18.47% with the enhancement of 7.04% and 8.46%, respectively.