High efficiency inverted polymeric bulk-heterojunction solar cells with hydrophilic conjugated polymers as cathode interlayer on ITO

Dual functional reduced graphene oxide as photoanode and counter electrode in dye-sensitized solar cells and its exceptional efficiency enhancement

“…The incorporation of Ppy and rGO solved the hydrophobicity problem of rGO, which apparently make the counter electrode hydrophilic because Ppy has a hydrophilic property [62]. The hydrophilic Ppy-rGO-1.0pTS counter electrode gave rise to the efficient extractions of electrons, from which a higher short-circuit current (J sc ) and fill factor (FF) were achieved [63]. In addition, the hydrophilic surface was found to have a good electrode-electrolyte interfacial contact in the DSSC application [64].…”

8.9% Single‐Stack Inverted Polymer Solar Cells with Electron‐Rich Polymer Nanolayer‐Modified Inorganic Electron‐Collecting Buffer Layers

“…[ 21,22 ] As an alternative approach, organic dipole layers such as conjugated polyelectrolytes (CPE), organic salts, and zwitterions have been introduced to modify the work function of electron-collecting electrodes and/or buffer layers. [ 16,[23][24][25][26] However, such electrolyte materials still have issues such as narrow (limited) selection windows for salts and uneasiness of synthesis for CPE although they helped to improve device performance. [25][26][27][28] Very recently, poly(ethyleneimine) (PEI) or poly-(ethyleneimine)-ethoxylated (PEIE), which are inexpensive .…”

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

“…It was proposed that these hydrophilic organic interlayers can recover the lost open-circuit voltage (V oc ) and enhance the electron collection from the acceptor to ITO, because of the built-in field deriving from the interfacial dipole of the interlayer [11,34]. Under the guidance of this theory, several specific functional groups are introduced to alcohol-soluble interface materials, such as ethylene oxide [35], phosphonate [36,37], amino [38][39][40][41][42] and ammonium [43,44]. In our previous study, we have reported a series of alcohol-soluble small molecules including amino and ammonium derivatives, and used them as charge-injection materials for polymer lightemitting diodes (PLEDs) [45].…”