Jung, Jae Woong Park, Joon-Suh Han, Il Ki Lee, Yujeong Park, Cheolmin Kwon, Woosung Park, Minwoo 2024-01-20T01:04:15Z 2024-01-20T01:04:15Z 2021-09-04 2017-06-28 2050-7488 https://pubs.kist.re.kr/handle/201004/122611 Poly(3-hexylthiophene) (P3HT) is a promising p-type polymer to optimize the architecture, charge transfer, and environmental stability in electronic devices. Therefore, it can be a suitable material for a hole transporting layer in lead halide perovskite solar cells (PSCs). However, the mismatch of band alignment with perovskites suppresses efficient charge extraction and transfer. This results in the significant loss of open-circuit voltage (Voc) and resultant device performance deterioration. Therefore, modifying the energy level is essential to improve band alignment with perovskites. Here, a cobalt complex, tris(2-(1H-pyrazol-1-yl) pyridine) cobalt(II) di[bis(trifluoromethane) sulfonimide] (Co(II)-TFSI) is used as a p-dopant in P3HT. This enhances the conductivity and leads to a downward shift of the energy levels. The efficient charge extraction and transfer from perovskite considerably improves the device performance, resulting in a power conversion efficiency (PCE) of 16.28% and Voc of 1.061 V. Moreover, a flexible device incorporating Co-P3HT exhibits impressive 11.84% PCE and mechanical stability up to 600 bending cycles. And the flexible Co-P3HT device shows better air stability than the Li-doped P3HT (Li-P3HT) device for 40 days. These results suggest that Co(II)-TFSI is an alternative to Li salts to realize high performance in PSCs incorporating polythiophene derivatives. English ROYAL SOC CHEMISTRY LIGHT-EMITTING-DIODES MULTILAYER FILM MORPHOLOGY HIGH-PERFORMANCE DIFFUSION LENGTHS ORGANIC SEMICONDUCTORS SINGLE-CRYSTALS LAYER DOPANT POLYMER IODIDE Flexible and highly efficient perovskite solar cells with a large active area incorporating cobalt-doped poly(3-hexylthiophene) for enhanced open-circuit voltage Article 10.1039/c7ta03541a 1 JOURNAL OF MATERIALS CHEMISTRY A, v.5, no.24, pp.12158 - 12167 JOURNAL OF MATERIALS CHEMISTRY A 5 24 12158 12167 scie scopus 000403664800023 2-s2.0-85021674614 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article LIGHT-EMITTING-DIODES MULTILAYER FILM MORPHOLOGY HIGH-PERFORMANCE DIFFUSION LENGTHS ORGANIC SEMICONDUCTORS SINGLE-CRYSTALS LAYER DOPANT POLYMER IODIDE