%0 Journal Article %1 ADFM:ADFM201601764 %A Dong, Wan Jae %A Park, Jae Yong %A Ham, Juyoung %A Jung, Gwan Ho %A Lee, Illhwan %A Lee, Jong-Lam %D 2016 %J Advanced Functional Materials %K cavity organics %N 30 %P 5437--5446 %R 10.1002/adfm.201601764 %T Dual Effect of ITO-Interlayer on Inverted Top-Illuminated Polymer Solar Cells: Wetting of Polyelectrolyte and Tuning of Cavity %U http://dx.doi.org/10.1002/adfm.201601764 %V 26 %X Flexible inverted top-illuminated polymer solar cells (IT-PSCs) are fabricated by wetting of polyelectrolyte and designing a microcavity structure by laying an indium-tin-oxide (ITO) interlayer on top of an Ag reflector. The ITO-coated Ag makes the surface hydrophilic, thereby improving wettability of polyethyleneimine (PEIE). This increased wettability of PEIE yields a reflective cathode with low work function of 3.73 eV. The ITO layer also tunes the light absorption spectrum in the active layer. Finite-domain time-difference simulation provides evidence that the ITO layer played a role in both the shift in resonant wavelength in the microcavity and confinement of the electric field to the active layer. Time-dependent simulation suggests that the time to reach steady-state light absorption is longer (6.6 fs) when a microcavity is present than when it is not present (3.8 fs); i.e., the microcavity increases light absorption in the active layer. The designed IT-PSCs show a maximum photo-conversion efficiency of 6.4% on plastic film and 6.1% on opaque copper foil; these are the highest values obtained by top-illuminated PSCs on a metallic substrate. The IT-PSCs have excellent mechanical flexibility and more stable in air than conventional normal structured devices.

@article{ADFM:ADFM201601764, abstract = {Flexible inverted top-illuminated polymer solar cells (IT-PSCs) are fabricated by wetting of polyelectrolyte and designing a microcavity structure by laying an indium-tin-oxide (ITO) interlayer on top of an Ag reflector. The ITO-coated Ag makes the surface hydrophilic, thereby improving wettability of polyethyleneimine (PEIE). This increased wettability of PEIE yields a reflective cathode with low work function of 3.73 eV. The ITO layer also tunes the light absorption spectrum in the active layer. Finite-domain time-difference simulation provides evidence that the ITO layer played a role in both the shift in resonant wavelength in the microcavity and confinement of the electric field to the active layer. Time-dependent simulation suggests that the time to reach steady-state light absorption is longer (6.6 fs) when a microcavity is present than when it is not present (3.8 fs); i.e., the microcavity increases light absorption in the active layer. The designed IT-PSCs show a maximum photo-conversion efficiency of 6.4% on plastic film and 6.1% on opaque copper foil; these are the highest values obtained by top-illuminated PSCs on a metallic substrate. The IT-PSCs have excellent mechanical flexibility and more stable in air than conventional normal structured devices.}, added-at = {2016-08-09T13:10:28.000+0200}, author = {Dong, Wan Jae and Park, Jae Yong and Ham, Juyoung and Jung, Gwan Ho and Lee, Illhwan and Lee, Jong-Lam}, biburl = {https://www.bibsonomy.org/bibtex/2cfcb80c0d6125452c46630a1ebecc2cf/cgoehler}, doi = {10.1002/adfm.201601764}, interhash = {565b66c0b36c4f74cb8854f5966483ca}, intrahash = {cfcb80c0d6125452c46630a1ebecc2cf}, issn = {1616-3028}, journal = {Advanced Functional Materials}, keywords = {cavity organics}, number = 30, pages = {5437--5446}, timestamp = {2016-08-09T13:10:28.000+0200}, title = {Dual Effect of ITO-Interlayer on Inverted Top-Illuminated Polymer Solar Cells: Wetting of Polyelectrolyte and Tuning of Cavity}, url = {http://dx.doi.org/10.1002/adfm.201601764}, volume = 26, year = 2016 }