Enhanced thermal stability of organic photovoltaics via incorporating triphenylamine derivatives as additives
Journal
Solar Energy Materials and Solar Cells
Journal Volume
157
Pages
666-675
Date Issued
2016
Author(s)
Abstract
In this work, we prepared four star-shaped conjugated small molecules, the triphenylamine dithiophene (TBT) derivatives, namely TBT-H, TBT-Br, TBT-OH, and TBT-N3 presenting hydride, bromide, hydroxyl, and azide terminal functional groups, respectively. These TBT derivatives were used as additives in the active layers of organic photovoltaics to investigate the effect of intermolecular interactions (TBT-H, TBT-OH) or crosslinking (TBT-N3, TBT-Br) on the long-term thermal stability of the devices. From analyses of blend film morphologies, and optoelectronic and device performance, we observed significant enhancements in thermal stability during accelerated heating tests at 150 °C for the devices incorporated with the additives TBT-N3 and TBT-Br. These two additives functioned as crosslinkers, and constructed local borders that effectively impeded heat-promoted fullerene aggregation, thereby leading to highly stable morphologies. When compared with corresponding normal devices, the TBT-N3–derived devices based on poly(3-hexylthiophene) exhibited greater stability, with the power conversion efficiency (PCE) remaining as high as 2.5% after 144h at 150 °C. Because of this enhancement, a device based on an amorphous low-bandgap polymer, namely poly(thieno[3,4-b]thiophene-alt-benzodithiophene), with the addition of TBT-N3 was fabricated. We observed a significant improvement in device stability, retaining approximately 60% (from 5.0 to 3.3%) of its initial PCE under accelerated heating (150 °C). In contrast, the PCE of the corresponding normal device decayed to 0.01% of its initial value. © 2016 Elsevier B.V.
Subjects
Crosslinker; Intermolecular interaction; Organic photovoltaic; Thermal stability
SDGs
Other Subjects
Bromine compounds; Photovoltaic effects; Stability; Conjugated small molecules; Crosslinker; Intermolecular interactions; Organic photovoltaics; Poly (3-hexylthiophene); Power conversion efficiencies; Thieno[3 ,4-b]thiophene; Triphenylamine derivatives; Thermodynamic stability
Type
journal article