Abstract
The performance and industrial viability of organic photovoltaics are strongly influenced by the functionality and stability of interface layers. Many of the interface materials most commonly used in the lab are limited in their operational stability or their materials cost and are frequently not transferred toward large-scale production and industrial applications. In this work, an advanced aqueous-solution-processed cathode interface layer is demonstrated based on cost-effective organosilica nanodots (OSiNDs) synthesized via a simple one-step hydrothermal reaction. Compared to the interface layers optimized for inverted organic solar cells (i-OSCs), the OSiNDs cathode interlayer shows improved charge carrier extraction and excellent operational stability for various model photoactive systems, achieving a remarkably high power conversion efficiency up to 17.15%. More importantly, the OSiNDs' interlayer is extremely stable under thermal stress or photoillumination (UV and AM 1.5G) and undergoes no photochemical reaction with the photoactive materials used. As a result, the operational stability of inverted OSCs under continuous 1 sun illumination (AM 1.5G, 100mW cm-2 ) is significantly improved by replacing the commonly used ZnO interlayer with OSiND-based interfaces.
Highlights
The stability for inverted organic solar cells (i-OSCs), the organosilica nanodots (OSiNDs) cathode interlayer shows improved charge carrier extraction and excellent operational stability for various model photoactive systems, achieving a remarkably high power conversion efficiency up to 17.15%
The high photostability is attributed to the avoidance of photoinduced shunts and photo catalyst effect in OSiND-based OSCs. These results clearly show that OSiNDs are promising cathode interlayers, and may inspire the design and development of a new class of interlayer materials for highly efficient and photostable OSCs
We investigated the current density for OSiNDs and Zinc oxide (ZnO)-based electron-only devices (Figure S12a, Supporting Information)
Summary
OSCs.[11,12,13,14,15] On the one hand, the stability for inverted organic solar cells (i-OSCs), the OSiNDs cathode interlayer shows improved charge carrier extraction and excellent operational stability for various model photoactive systems, achieving a remarkably high power conversion efficiency up to 17.15%. The ZnO-based device exhibited a maximum PCE (PCEmax) of 15.75% with an open-circuit voltage (Voc) of 0.83 V, a shortcircuit current density (Jsc) of 25.07 mA cm−2, and a fill factor (FF) of 75.69%, which are comparable to the values published in previous reports.[31] Using OSiNDs as the cathode interlayer could slightly increase the Jsc to 25.54 mA cm−2 and FF to >76%, resulting in a PCEmax of 16.15%.
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