Recent Advances on Renewable and Biodegradable Cellulose Nanopaper Substrates for Transparent Light-Harvesting Devices: Interaction with Humid Environment

Figure 6

(a) Device architecture of a polymer solar cell deposited on CNC nanopaper. The evaporation of a thin layer of Ag allows deposition of the bottom electrode that was then modified through a thin layer of ethoxylated polyethylenimine (PEIE); (b) chemical structure of the active materials. PBDTTT-C: poly[(4,8-bis-(2-ethylhexyloxy)-benzo[1,2-b:4,5-b9]dithiophene)-2,6-diyl-alt-(4-(2-ethylhexanoyl)-thieno[3,4-b]thiophene)-2,6-diyl], polymer donor; PCBM: phenyl-C61-butyric acid methyl ester, molecular acceptor; (c) a photograph of the polymer solar cell deposited on nanopaper; (d) JV characteristics of the solar cell in the dark (black) and under illumination on the nanopaper side (red); (e) JV characteristics in a semilogarithmic scale. Reproduced from reference [35] with permission from Springer Nature.

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