Fabrication of Flexible and Semitransparent PTB7:PC₇₁BM Organic Solar Cells

Abstract

Semitransparent bulk-heterojunction (BHJ) solar cells have attracted a strong attention due to the possible use in new photovoltaic applications. However, semitransparent BHJ solar cells on flexible substrates have not yet been developed. In this work, flexible BHJ solar cells were fabricated on an ITO/PET substrate using an inverted PET/ITO/PFN/PTB7:PC71BM/MoO3/Au device structure. The power conversion efficiency (PCE) of the device was 3.4 %. Fabrication of semitransparent solar cells was further demonstrated utilizing a MoO3/Au/MoO3 transparent anode. The semitransparent solar cell showed bifacial energy generation when illuminated from both front and backside. The PCEs with illumination from the ITO or Au/MoO3 side were 2.7 % and 2.1 %, respectively. These results showed that a semitransparent PTB7:PC71BM solar cell was successfully fabricated on flexible PET substrates.

Structural and electrical characterizations of the as grown and annealed Au/MοO3/In/MoO3/C bandpass filters

“…Metal‐sandwiched molybdenum trioxide is also reported to be highly effective in optoelectronic technology . Mainly, multilayers of MoO 3 /Ag/MoO 3 electrodes are used as flexible and transparent electrodes showing high performance flexible thin film heaters .…”

“…Mainly, multilayers of MoO 3 /Ag/MoO 3 electrodes are used as flexible and transparent electrodes showing high performance flexible thin film heaters . In addition, MoO 3 /Au/MoO 3 is used as transparent anode that can be employed in fabrication of flexible and semitransparent organic solar cells . As another element of optoelectronics, MoO 3 /Al/MoO 3 structures displayed high optical transmittance (~90%) in visible light region of light nominating the material for fabricating transparent electronic devices.…”