Thienylvinylenethienyl and Naphthalene Core Substituted with Triphenylamines—Highly Efficient Hole Transporting Materials and Their Comparative Study for Inverted Perovskite Solar Cells. Issue 8 (19th July 2017) - Pham, Hong Duc
Abstract : In this report, two simple cost efficient solution processable small molecular hole transporting materials (HTMs) are synthesized and used successfully in inverted perovskite devices. These HTMs, namely ( E )‐4, 4'‐(ethene‐1, 2‐diylbis(thiophene‐5, 2‐diyl))bis(N, N‐bis(4‐methoxyphenyl)aniline) (TPA‐TVT‐TPA ) and 4, 4'‐(naphthalene‐2, 6‐diyl)bis(N, N‐bis(4‐methoxyphenyl)aniline) (TPA‐NAP‐TPA ), are designed by using triphenylamine methoxy as common end capping groups with thienylvinylenethienyl and naphthalene cores respectively. They possess good solubility in common organic solvents. Additionally, they have not only appropriate highest occupied molecular orbital energy levels for good hole injection ability but also sufficient lowest unoccupied molecular orbital for electron blocking capability. The power conversion efficiency (PCE) of these HTMs based devices is found to be of 16.32% forTPA‐TVT‐TPA and 14.63% forTPA‐NAP‐TPA . Particularly, TPA‐TVT‐TPA exhibits an impressive V oc of 1.07 V. The obtained performance is one of the highest performances in inverted perovskite layouts. The cut‐price and straightforward synthesis with elegant scale up makes these classes of materials important for the industry to produce high‐throughput printed perovskite solar cells for large area applications. Abstract : A simple and cost‐effective hole‐transporting materials have been synthesized and used successfully in inverted perovskite solar cells. The device with TPA‐TVT‐TPA exhibited a high power conversion energy of 16.32% and it is going to be the suitable replacement to the expensive PEDOT:PSS.