利用循环伏安法估算有机太阳能电池中给体-受体聚合物的能量能级

Abstract Cyclic voltammetry is a powerful electrochemical tool for obtaining electrical properties as energy levels in polymers. Herein, it has been used to estimate the HOMO and LUMO energy levels of the donor and acceptor polymers, P3HT and PC 61 BM, by varying of GeS 2 nanoparticles, in addition to estimating other parameters such as the E g , ΔLUMO, and the theoretical V oc . The data obtained were contrasted with an experiment of P3HT:PC 61 BM:GeS 2 inverted organic solar cells to determine the influence of GeS 2 on the energy levels and the reported solar efficiency. Without the addition of nanoparticles to the polymer samples, an E g of 1.88 eV and 2.25 eV was obtained for P3HT and PC 61 BM, respectively. In addition, a V oc of 1.13 V and an E dis of 0.76 V were found. However, the addition of GeS 2 nanoparticles modified these values, finding a substantial improvement with 0.75 wt% of GeS 2 modifying the E g to 1.47 eV and 2.52 eV for the P3HT and the PC 61 BM, respectively, with a V oc of 1.31 V and an E dis of 0.15 V. A correlation was found between the estimated theoretical V oc with the experimental V oc and the PCE. Precisely, the best experimental result was with 0.75 wt% of nanoparticles, obtaining a maximum efficiency of 2.18 % and an average device efficiency of 1.99 %.