表面配体对AgBiS2-PTB7杂化太阳电池性能的影响

Influence of Different Surface Ligands on The Performance of Colloidal AgBiS2 Quantum-dots PTB7 Solar Cells

摘要:

基于胶体量子点活性材料的太阳电池目前面临的共性问题是量子点表面长碳链配体不导电,极大限制了载流子的传输和器件性能。对AgBiS2胶体量子点活性层采用固态配体交换方法,用不同短链配体对长链的油酸配体进行交换,讨论了不同配体交换对材料能级和器件关键参数的影响。结果表明,不同配体置换长链配体的能力不同,配体交换不仅有效提升了薄膜的电荷传导和钝化量子点的表面缺陷,还实现了对量子点材料能级的有效调节。解释了表面配体对量子点太阳电池性能影响的作用机理。为进一步提升胶体量子点太阳电池性能提供了有效方案。

Abstract:

Dielectric capping ligands on the quantum dots (QDs) surface are the common challenge of solar cells with QDs active layer, which greatly limits the carrier transmission and device performance. In this work, for AgBiS2 quantum-dots active layer, different short-chain ligands were used to replace the long-chain capping ligands oleic acid on QDs by using the solid state ligand exchange method. The influences of ligands on the materials HOMO/LUMO levels and performance of AgBiS2-PTB7 device were discussed. It is shown that the TMAI ligands delivers the best device performance with PCE of 2.06%, Voc of 0.412V, Jsc of 9.23mA/cm2 and FF of 53.4%.