Effect of an ambient environment on light-induced degradation of organic solar cells based on a benzodithiophene–quinoxaline copolymer in air

Abstract

Degradation of polymer molecules is one of the main factors that reduces the life time of thin film organic solar cells. The mechanisms of such degradations are not yet all...

Self-Assembled Monolayer Engineered ZnO Electron Transport Layer to Improve the Photostability of Organic Solar Cells

“…In an ideal solar cell, J sc is linearly dependent on P in , corresponding to minimal bimolecular recombination at short circuit conditions . Therefore, bimolecular recombination is present when there is any divergence from α ≈ 1 Figure c illustrates the fitted α values of the pristine ZnO, ODT@ZnO, and OTMS@ZnO ETLs-based devices, which were found to be 0.96, 0.98, and 0.99, respectively.…”

“…Lifetime studies play a crucial role in assessing the commercial viability of OSC devices. Transport layers and interfaces are identified as one of the reasons for degradation in OSC. , To evaluate the photostability of the fabricated i-OSCs, they were subjected to AM 1.5 illumination and the time evolution of normalized PV parameters was monitored. Figure a–d illustrates the changes in these parameters over time for the pristine ZnO, ODT-treated ZnO, and OTMS-treated ZnO ETL-based i-OSC devices with initial PCEs of 4.20, 5.01, and 5.37%, respectively.…”

“…The degradations of all ZnO ETL-based thin films and OSC devices with and without SAM modification were monitored under an ambient atmosphere. The samples were subjected to degradation following the ISOSL-3 protocol , using a tungsten lamp with an intensity of 100 mW/cm 2 . A ventilator was used to prevnt thermal-induced degradation.…”

“…13 Therefore, bimolecular recombination is present when there is any divergence from α ≈ 1. 37 Figure 3c illustrates the fitted α values of the pristine ZnO, ODT@ZnO, and OTMS@ZnO ETLs-based devices, which were found to be 0.96, 0.98, and 0.99, respectively. These findings confirm that the SAM-treated devices exhibited a reduced occurrence of bimolecular recombination.…”

Tailoring intra-molecular coupling in BDT-based copolymers to enhance their performance in fullerene-free organic solar cells

“…The optical, electrical, and morphological properties of conjugated polymers can be effectively tailored using rationally designed D-A coupling. isoindigo, 8,9 quinoxaline, 10 benzothiadiazole (BTD) 11 and benzotriazole (BTA) are a few examples of acceptor materials that are frequently utilized as electron withdrawing units in D-A copolymers. Due to its lower electron withdrawing properties compared to the BTD acceptor, the BTA unit is frequently utilized in the design of wide band gap copolymers.…”