Inexpensive Hole‐Transporting Materials Derived from Tröger's Base Afford Efficient and Stable Perovskite Solar Cells. (3rd July 2019) - Braukyla, Titas
Abstract: The synthesis of three enamine hole‐transporting materials (HTMs) based on Tröger's base scaffold are reported. These compounds are obtained in a three‐step facile synthesis from commercially available materials without the need of expensive catalysts, inert conditions or time‐consuming purification steps. The best performing material, HTM3, demonstrated 18.62 % PCE in PSCs, rivaling spiro‐OMeTAD in efficiency, and showing markedly superior long‐term stability in non‐encapsulated devices. In dopant‐free PSCs, HTM3 outperformed spiro‐OMeTAD by a factror of 1.6. The high glass‐transition temperature ( T g =176 °C) of HTM3 also suggests promising perspectives in device applications. Abstract : Drei Enamin ‐Lochleitungsmaterialien (HTMs) wurden synthetisiert, die auf dem Gerüst der Trögerschen Base beruhen. Diese Verbindungen konnten durch eine einfache, dreistufige Synthese aus kommerziell verfügbaren Ausgangsverbindungen erhalten werden, ohne teure Katalysatoren, inerte Reaktionsbedingungen oder zeitaufwändige Aufreinigungsschritte zu benötigen.