Effect of counter anions and side-chain modification of conjugated polymers for organic solar cells as an interlayer: An in-depth investigation of the diverse modification of ionic functionality

Novel Polyelectrolytes Based on Naphthalene Diimide with Different Counteranions for Cathode Interlayers in Polymer Solar Cells

“…A PCE of 9.51% was obtained by utilizing PF-NDIN-Br-OH as the cathode interlayer, with a of 17.9 mA cm −2 , a of 0.79 V, and an of 67.7%, leading to enhanced PCE compared to the ZnO-only-based device (8.96%). There are reports indicating that the presence of terminal hydroxyl groups in polyelectrolytes can enhance the interfacial properties of the device [ 30 ]. Incorporation of PF-NDIN-I-OH showed an improved PCE, up to 9.59%, compared to the device based on PF-NDIN-Br-OH due to the significant improvement in .…”

“…The presence of the polyelectrolyte layer results in a shift from a Schottky contact to an Ohmic contact at the cathode interfaces, which in turn leads to a reduction in the value. The device with PF-NDIN-Br-OH demonstrated higher shunt resistance ( ) values than the ZnO-only-based device (0.77 kΩ cm 2 ), by minimizing short circuits between the contacts [ 30 ]. The devices incorporating PF-NDIN-I-OH demonstrate the lowest values of 0.69 kΩ cm 2 .…”

“…Polyelectrolytes with various CAs have been utilized to maximize the collection of charge capability at the cathode interface [ 29 ]. Furthermore, previous studies have shown that the modification of polyelectrolytes with side chains containing hydroxyl groups can impact the PCE [ 30 ]. In the present study, we aim to integrate both of these approaches to examine the synergistic effects of polyelectrolytes with hydroxyl groups at the side chain and larger anions (e.g., iodide) when applied to PSCs [ 31 , 32 , 33 , 34 ].…”

Enhanced Selective Contact Behavior in a‐Si:H/oxide Transparent Photovoltaic Devices via Dipole Layer Integration

“…[19,24] Counter anion is understood to be critical to enhance the dipole effect on these cationic polymer sites. [25] Nevertheless, Lewis basicity of amino groups combined with slightly acidic solvents (e.g., anhydrous methanol, pH 6) promotes the formation of a conjugated charged system necessary for the formation of dipole systems. Equal chemical nature of the cationic sites, as well as counter anions in PEI and PAMAM G 1 and G 2 (i.e., protonated amino/ methanolate systems), allows for qualitative interpretation of the PV results.…”

DPP-bridged narrow band gap oligomer-like donor materials: significant effect of molecular structure regulation on photovoltaic performance

“…The two benzene rings are connected by a central five-membered ring with excellent planarity, which is conducive to both the intramolecular charge transfer and the formation of effective π–π stacking between molecules in the active layer, which is more conducive to the promotion of carrier transport. 19 In addition, the carbon on the fused ring bridge with sp 3 hybrid (sp 3 -C) is replaced by an alkyl chain, which increases the solubility while being orthogonal to the conjugated main chain, to avoid excessive molecular self-aggregation and obtaining ideal active layer morphology. 19 d Furthermore, more surprising is that due to the weak electron-donating ability of Flu, the HOMO energy level is reduced, and the open-circuit ( V oc ) of Flu-based devices is up to 1.4 V. 20…”