An explanation for the high stability of polycarboxythiophenes in photovoltaic devices—A solid-state NMR dipolar recoupling study

Fabrication of Polymer Solar Cells Using Aqueous Processing for All Layers Including the Metal Back Electrode

“…The fullerene 2 (see Scheme 1 ) containing an advantages of solubility switching, removal of the side chains from the bulk of the active layer furthermore means removal of non-absorbing material, and several studies show enhanced stability of the active layer towards general degradation. [9][10][11] A tertiary ester side chain containing polyether units as well as free alcohol groups was synthesized in order to promote solubility towards aqueous media and simultaneously allowing for evaporative removal of the cleaved side chains from the active layer after cleavage -a feat that would not have been possible if ionic containing side chains had been used.…”

Progress in Organic Photovoltaic Fibers Research

“…However, use of PET foils is limited because it melts about 140 ºC (Zimmermann et al, 2007;Krebs, 2009a;Krebs, 2009b). Thermocleavable materials are used for the preparation of very stable solar cells (Liu et al, 2004;Krebs & Spanggaard 2005;Krebs & Norrman, 2007;Krebs, 2008;Bjerring et al, 2008;Krebs et al, 2008) but, these materials are required to heat to a temperature of around 200ºC to achieve insolubility, which is a limitation to use of PET foils in conventional methods. However, PET substrates can be used with thermocleavable materials thanks to longer processing time (Krebs, 2009b).…”

Pad printing as a film forming technique for polymer solar cells

“…The choice of polymer system was based on the thermocleavable material poly-(3-(2-methylhexyloxy)carboxydithiophene) (P3MHOCT) [29] that has been subjected to numerous studies since it gives rise to polymer solar cells with stable operation for thousands of hours in inert atmosphere [33][34][35][36] and a good degree of operational stability in the ambient atmosphere of 4500 h [23] (Fig. 5).…”