Slot‐Die‐Coated V₂O₅ as Hole Transport Layer for Flexible Organic Solar Cells and Optoelectronic Devices

Abstract

Vanadium pentoxide has been proposed as a good alternative hole transport layer for improving device lifetime of organic photovoltaics. The article presents a study on the optimization of slot-diecoated vanadium oxide films produced with a roll coating machine with the aim of achieving scalable organic solar cells and photo-detectors with improved performance. The effect of different diluents on the electrical properties of the vanadium oxide films is investigated, and methodologies for efficient interfacing of the anode are studied. Furthermore, the lifetime of the cells with incorporated vanadium oxide is investigated employing different encapsulation methods. Finally, an application of the manufactured scalable devices in proximity sensors is demonstrated using a 3D-printed scaffold.

Baselines for Lifetime of Organic Solar Cells

“…Nevertheless, despite a number of reports of impressive intrinsic stability, producing samples in a roll-to-roll compatible process with sufficient stability under light test presents a serious challenge that still needs to be addressed [16]. The diagram has been updated by additions from the new dataset and is presented in Figure 5.…”

Dual‐Fiber Approach toward Flexible Multifunctional Hybrid Materials

“…V 2 O 5 xerogels are known to exhibit both electronic and ionic conduction, which depend on the oxidation state of vanadium (V 5+ vs V 4+ ) and the hydration state of the xerogel . Therefore, V 2 O 5 xerogels have received great interest as electroactive compound in various electronic and redox‐related applications, including electrochromic displays, solar cells, or batteries . Here, the in‐plane electrical conductivity of the 2w‐VNF films was determined to be 1.6 S cm −1 , which is significantly higher than for previously reported V 2 O 5 xerogels (10 −5 –10 −2 S cm −1 ) .…”

A wide temperature tolerance, solution-processed MoOx interface layer for efficient and stable organic solar cells

“…Potential alternatives for aforementioned purpose are transition metal oxides, such as V 2 O 5 [23][24][25], WO 3 [26][27][28], NiO [12,29], and MoO 3 [30][31][32][33][34][35][36][37], which have necessary semiconductor property and well physiochemical stability. Among this transition metal oxides, MoO 3 is one of the promising candidates due to its nontoxicity, deep electronic state and relative lower vaporization temperature (o800°C) which can easily deposited in vacuum [37].…”