Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector
Efficiency above 6% in poly(3?hexylthiophene):phenyl?C?butyric acid methyl ester photovoltaics via simultaneous addition of poly(3?hexylthiophene) based grafted graphene nanosheets and hydrophobic block copolymers
A combination of reduced graphene oxide grafted with poly(3?hexylthiophene) (P3HT) and P3HT?b?polystyrene copolymers was utilized to increase the efficiency of P3HT:[6,6]?phenyl?C71?butyric acid methyl ester devices above 6%.A combination of reduced graphene oxide (rGO) nanosheets grafted with regioregular poly(3?hexylthiophene) (P3HT) (rGO?g?P3HT) and P3HT?b?polystyrene (PS) block copolymers was utilized to modify the morphology of P3HT:[6,6]?phenyl?C71?butyric acid methyl ester (PC71BM) active layers in photovoltaic devices. Efficiencies greater than 6% were acquired after a mild thermal annealing. To this end, the assembling of P3HT homopolymers and P3HT?b?PS block copolymers onto rGO?g?P3HT nanosheets was investigated, showing that the copolymers were assembled from the P3HT side onto the rGO?g?P3HT nanosheets. Assembling of P3HT?b?PS block copolymers onto the rGO?g?P3HT nanosheets developed the net hole and electron highways for charge transport, thereby in addition to photoluminescence quenching the charge mobility (?h and ?e) values increased considerably. The best charge mobilities were acquired for the P3HT50000:PC71BM:rGO?g?P3HT50000:P3HT7000?b?PS1000 system (?h?=?1.9?×?10?5 cm2 V–1 s–1 and ?e?=?0.8?×?10?4 cm2 V–1 s–1). Thermal annealing conducted at 120 °C also further increased the hole and electron mobilities to 9.8?×?10?4 and 2.7?×?10?3 cm2 V–1 s–1, respectively. The thermal annealing acted as a driving force for better assembly of the P3HT?b?PS copolymers onto the rGO?g?P3HT nanosheets. This phenomenon improved the short circuit current density, fill factor, open circuit voltage and power conversion efficiency parameters from 11.13?mA cm?2, 0.63?V, 62% and 4.35% to 12.98?mA cm?2, 0.69?V, 68% and 6.09%, respectively. © 2019 Society of Chemical Industry
» Author: Ehsan Mohammadi?Arbati, Samira Agbolaghi
» Reference: doi:10.1002/pi.5816
» Publication Date: 15/04/2019
This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 768737
