Effects of Overnight Oxidation on Perovskite Solar Cells with Co(III)TFSI Co-Doped Spiro-OMeTAD

Metal-halide perovskite solar cells (PSCs) have achieved remarkable power conversion efficiencies in recent years, and spiro-OMeTAD plays a significant role as hole transport material PSCs with record efficiencies. However, further studies systematic experimental procedures on doped are required to enable reliable process for potential commercialization. In particular, the effect of prolonged oxidation Co(III)TFSI co-doped has been one unanswered topics PSC research. this work, we investigate influence overnight performance spiro-OMeTAD. Co-doping Co(III) complexes instantly oxidizes spiro-OMeTAD, leading an improvement efficiency (PCE) from 13.1% (LiTFSI-doped spiro-OMeTAD) 17.6% (LiTFSI + Co(III)TFSI-doped spiro-OMeTAD). It is found that without could retain around 90% under maximum point tracking at 1-sun illumination 3000 min, whereas drop by more than 30% when exposed oxidation. Hence, it important inhibit unnecessary so save excess fabrication time overcome poor stability issues.