Solution processible small porphyrins

Huang Y, Li L, Peng X et al (2012) Solution processed small molecule bulk heterojunction organic photovoltaics based on a conjugated donor-acceptor porphyrin. J Mater Chem 22(41) 21841-21844... 

An alternative route to solution-processible organic semiconductors is to use precursors to small molecule semiconductors, such as pentacene [59] or tetrabenzo-porphyrin [60], which can be converted into their fully conjugated, insoluble form by thermal or irradiative [61] treatment on the substrate. Pentacene precursors have been shown to yield field-effect mobilities of 0.01-0.1 cm2 V-1 s 1 [62], and 0.1-0.8 cm2 V-1 s 1 [63] after thermal conversion at 150-200 °C. Small molecule organic semiconductors can also be rendered solution processible by attachment of flexible side chains [64-66], Due to the relatively low solubility of these molecules the growth of uniform thin films of these molecules remains challenging, however. 

Li L, Huang Y, Peng J et al (2013) Enhanced performance of solution-processed solar cells based on porphyrin small molecules with a diketopyrrolopyrrole acceptor unit and a pyridine additive. J Mater Chem A 1(6) 2144-2150... 

Yamamoto T, Hatano J, Nakagawa T et al (2013) Small molecule solution-processed bulk heterojunction solar cells with inverted structure using porphyrin donor. Appl Phys Lett 102(1) 013305... 

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