Dopamine Semiquinone Radical Doped PEDOT:PSS: Enhanced Conductivity, Work Function and Performance in Organic Solar Cells. Issue 25 (19th May 2020) - Zeng, Miao
Abstract: Poly(3, 4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been is applied as hole transport material in organic electronic devices for more than 20 years. However, the redundant sulfonic acid group of PEDOT:PSS has often been overlooked. Herein, PEDOT:PSS‐DA is prepared via a facile doping of PEDOT:PSS with dopamine hydrochloride (DA·HCl) which reacts with the redundant sulfonic acid of PSS. The PEDOT:PSS‐DA film exhibits enhanced work function and conductivity compared to those of PEDOT:PSS. PEDOT:PSS‐DA‐based devices show a power conversion efficiency of 16.55% which is the highest in organic solar cells (OSCs) with (poly[(2, 6‐(4, 8‐bis(5‐(2‐ethylhexyl)‐4‐fluorothiophen‐2‐yl)benzo[1, 2‐b:4, 5‐b′]dithio‐phene))‐ co ‐(1, 3‐di(5‐thiophene‐2‐yl)‐5, 7‐bis(2‐ethylhexyl)‐benzo[1, 2‐c:4, 5‐c′]dithiophene‐4, 8‐dione))] (PM6):(2, 2′‐((2Z, 2′Z)‐((12, 13‐bis(2‐ethylhexyl)‐3, 9‐diundecyl‐12, 13‐dihydro‐[1, 2, 5]thiadiazolo[3, 4‐e]thieno[2′′, 3′:4′, 5′]thieno[2′, 3′:4, 5]pyrrolo[3, 2‐g]thieno[2′, 3′:4, 5]thieno[3, 2‐b]indole‐2, 10‐diyl)bis(methanylylidene))bis(5, 6‐difluoro‐3‐oxo‐2, 3‐dihydro‐1H‐indene‐2, 1‐diylidene))dimalononitrile) (Y6) as the active layer. Furthermore, PEDOT:PSS‐DA also exhibits enhanced performance in three other donor/acceptor systems, exhibiting high compatibility in OSCs. This work demonstrates that doping PEDOT:PSS with various amino derivatives is a potentially efficient strategy to enhance the performance of PEDOT:PSS in organic electronic devices. Abstract : The doping of poly(3, 4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with dopamine is reported. The doping of dopamine endows PEDOT:PSS with enhanced work function and conductivity. This work provides an efficient strategy to enhance the performances of organic solar cells.