Silver Nanowire Top Electrodes in Flexible Perovskite Solar Cells using Titanium Metal as Substrate

• Published in: ChemSusChem 2016-01, Vol.9 (1), p.31-35
• Main Authors: Lee, Minoh, Ko, Yohan, Min, Byoung Koun, Jun, Yongseok
• Format: Article
• Language: English
• Subjects: Calcium Compounds - chemistry; Electric Power Supplies; Electrodes; Equipment Design; Microscopy, Electron, Scanning; nanostructures; Nanowires - chemistry; Oxides - chemistry; perovskites; Silver - chemistry; silver nanowires; solar cells; Solar Energy; Spiro Compounds - chemistry; Surface Properties; Titanium; Titanium - chemistry
• ISSN: 1864-5631; 1864-564X
• DOI: 10.1002/cssc.201501332

Flexible perovskite solar cells (FPSCs) have various applications such as wearable electronic textiles and portable devices. In this work, we demonstrate FPSCs on a titanium metal substrate employing solution‐processed silver nanowires (Ag NWs) as the top electrode. The Ag NW electrodes were deposited on top of the spiro‐MeOTAD hole transport layer by a carefully controlled spray‐coating method at moderate temperatures. The power conversion efficiency (PCE) reached 7.45 % under AM 1.5 100 mW cm−2 illumination. Moreover, the efficiency for titanium‐based FPSCs decreased only slightly (by 2.6 % of the initial value) after the devices were bent 100 times. With this and other advances, fully solution‐based indium‐free flexible photovoltaics, advantageous in terms of price and processing, have the potential to be scaled into commercial production. Bend it like Yongseok: Flexible perovskite solar cells (FPSCs) are prepared, with solution‐processed silver nanowires (Ag NWs) as the top electrode on a titanium metal substrate. Deposition of the Ag NWs is carefully controlled using spray‐coating at moderate temperatures. The devices reach high power conversion efficiencies (PCEs), retaining them even after bending 100 times.