Highly Efficient and Air Stable Inverted Polymer Solar Cells Using LiF-Modified ITO Cathode and MoO₃/AgAl Alloy Anode

Abstract

The performance and air stability of inverted polymer solar cells (PSCs) were greatly improved using a combination of LiF-modified ITO cathode and a MoO3/AgAl alloy anode. The power conversion efficiency (PCE) of PSCs with AgAl contact reached 9.4%, which is higher than that of the cells with Ag (8.8%) and Al electrode (7.6%). The PCE of AgAl-based PSCs can further increase up to 10.3% through incorporating an ultrathin LiF-modified ITO. AgAl-based cells also exhibit a superior stability compared to the cells with Ag and Al contacts. PCE of the AgAl-based cells without encapsulation remains 78% of its original value after the cells were aged for 380 days in air. The presence of a LiF-modified ZnO interlayer between ITO and the organic active layer improves the charge collection. The improvement in PCE and stability of the AgAl-based cells is primarily attributed to the formation of AlOx at the MoO3/AgAl interface, preventing Ag diffusion and improving the built-in potential across the active layer in the cells.

A universal roll‐to‐roll slot‐die coating approach towards high‐efficiency organic photovoltaics

“…The normalized PCE of the module maintains 92% of its original performance after 65 days. The stability of our OPV flexible module is comparable to that of PTB7:PC 71 BM devices on ITO/glass electrode . This present study demonstrates the universal R2R slot‐die coating approach for various polymers (P3HT ~ LBG polymer) with respect to the up‐scaling from small high‐PCE cell to large area module.…”

Recent progress in stabilizing hybrid perovskites for solar cell applications

“…Al atoms diffusing out of AgAl alloy tend to oxidize to form AlO x , which acts as a barrier layer to inhibit not only the diffusion and agglomeration of Ag atoms but also the penetration of moisture and degradation products. [243,259,260] The AgAl-based cells without encapsulation retain 78% of the initial PCE after stored in air for 380 days. Even after continuous scanning for 10 min, the photocurrent was very stable and its high value of 18.3 mA cm -2 at 0.8 V resulted in the stabilized PCE of about 15%.…”

TiO2nanorod arrays hydrothermally grown on MgO-coated compact TiO2for efficient perovskite solar cells

“…Finally, an Ag-Al electrode (70 nm) was thermally evaporated at an atmospheric pressure of 10 À7 Torr to match the work function. 29,30…”