Solution-Processable N-Type Tin Phthalocyanines in Organic Thin Film Transistors and as Ternary Additives in Organic Photovoltaics

Tin phthalocyanines have shown promise in both organic thin film transistors (OTFTs) and organic photovoltaics (OPVs), however no examples of solution processable axial derivatives have been reported. We synthesized and characterized tin phthalocyanines (SnPcs) with tributyl silane and trihexyl silane axial functional groups and examined their performance in OTFTs and in poly(3-hexylthiophene) : phenyl-C61-butyric acid methyl ester (P3HT : PC61BM) OPV devices as ternary additives. We also report the OTFT performance of the previously studied trialkyl silane silicon phthalocyanines for comparison. In polycrystalline OTFTs the tin derivatives show higher electron mobilities than their silicon counterparts due to increased molecular interactions. As a ternary additive in OPV devices, similar to the SiPc analogues, both SnPc derivatives show an EQE contribution > 20% in the range of 650 – 750 nm. These results suggest soluble SnPcs show potential as active materials in OTFTs and OPVs, justifying further inves...