Solution-Processed Hybrid Cathode Interlayer for Inverted Organic Solar Cells

Abstract

A novel hybrid material CdS/2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (CdS·BCP) was prepared from the decomposition of its organic soluble precursor complex Cd(S2COEt)2·(BCP) by low-temperature treatment. CdS·BCP, which integrated the favorable properties of solvent durability, and high electron mobility of CdS as well as the good hole blocking property of BCP, was designed and developed as the interface modification material to improve electron collection in bulk heterojunction organic solar cells (OSCs). The inverted OSCs with CdS·BCP as buffer layer on ITO showed improved efficiency compared with the pure CdS or BCP. Devices with CdS·BCP as interlayer exhibited excellent stability, only 14.19% decay of power conversion efficiencies (PCEs) was observed (from 7.47% to 6.41%) after stored in glovebox for 3264 h (136 days). Our results demonstrate promising potentials of hybrid materials as the interface modification layers in OSCs, and provide new insights for the development of new interface modification materials in the future.

Controllable ZnMgO Electron‐Transporting Layers for Long‐Term Stable Organic Solar Cells with 8.06% Efficiency after One‐Year Storage

“…The devices for the stability measurements were encapsulated by the epoxy resin adhesive (Aldrich) with a glass cover under N 2 atmosphere. [ 27,31,[37][38][39][40][41][42] The longterm device lifetime (≥1 year) with PCEs >8% for the ZMObased OSCs in this work is also much better than that of the previous reported OSCs with short lifetimes of ≈15-37 d and PCEs of ≈4.5%-5.5%. All the inverted OSCs based on ZMO ETLs exhibit excellent stability and ultralong device lifetime to ambient exposure.…”

Understanding Low Bandgap Polymer PTB7 and Optimizing Polymer Solar Cells Based on It

“…Both effects promoted electron transport and enhanced J sc in the device and led to a PCE of 8.6%. Wu et al deposited a CdS‐BCP hybrid layer on ITO to lower the work function of ITO, making it closer to LUMO energy level of PC 70 BM and facilitating charge collection . The corresponding device showed improved stability with only 14.2% decrease in PCE after stored in glovebox without encapsulation for 136 h. In comparison, device with PEDOT:PSS layer exhibited 45.4% decreased PCE.…”

Zwitterionic ammonium and neutral amino molecules as cathode interlayer for inverted polymer solar cells

“…To achieve highly efficient inverted PSCs, it is critical to adjust electrical properties of the ITO and improve the electron collection ability [16,17]. In this regard, insertion of a cathode interlayer between the ITO and the photoactive layer is proved to be an effective method [18][19][20][21][22]. Recently, several kinds of materials were devoted to modify the ITO, including metal salts (Cs 2 CO 3 [12], CsF [23], etc.)…”