High performance polymer solar cells with a polar fullerene derivative as the cathode buffer layer

Abstract

A highly efficient polymer solar cell was fabricated using a polar fullerene derivative C60 pyrrolidine tris-acid (CPTA) as the cathode buffer layer. By introducing CPTA, the V oc , J sc and FF were all much enhanced simultaneously. The power conversion efficiency (PCE) was significantly improved to 7.92%, which outperformed the device using Ca/Al as the cathode in our experiment.

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.)…”

Finely Tuned Polymer Interlayers Enhance Solar Cell Efficiency

“…[1,2] For example,i nterlayers located between the active layer and conductive electrodes improve the selectivity of charge transport, and minimize series resistance (R s ), leading to PCE values exceeding 9% for single junction PSCs. [3][4][5][6][7] A blend of poly(ethylenedioxythiophene)a nd poly(styrene sulfonate) (PEDOT:PSS) functions as as olution-processible hole-selective anode modification layer that has proven generally useful for PSCs.R ecent efforts have been devoted to developing new cathode modification layers to enhance electron extraction efficiency.S mall-molecule organic interlayers integrated into PSCs afford noteworthy device improvement, including functional fullerenes, [4,[8][9][10][11][12][13][14][15][16] perylene diimides, [17] and oligomeric fluorenes. [5] Polymer interlayers provide advantages of both facile solution processing and robust film formation, with two recently reported examples being poly(ethyleneimine) (PEI) [18,19] and tertiary-aminesubstituted polyfluorene (PFN).…”

Application of a water-soluble metallophthalocyanine derivative as a cathode interlayer for the polymer solar cells

“…Compared to other cathode interfacial layer materials, advantages of alcohol/water-soluble organic materials are apparent in the PSCs due to their simple, vacuum-free and environment-friendly procedure to form film during the device fabrication and universality for different active layer and different metal cathode [22,23]. So far reported CILs improving the device performance mainly consist of polymers [24][25][26][27][28][29][30][31][32][33][34] and organic small molecules [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49]. Compared to polymers, organic small molecules are more attractive because of their several intrinsic advantages over the conjugated polymer counterpart in terms of easy purification, monodispersity and well-defined structures without end group contaminants and better batch-to-batch reproducibility.…”

“…Compared to polymers, organic small molecules are more attractive because of their several intrinsic advantages over the conjugated polymer counterpart in terms of easy purification, monodispersity and well-defined structures without end group contaminants and better batch-to-batch reproducibility. Successful alcohol/water soluble small molecular CIL materials include fullerene derivatives [35][36][37][38][39], perylene diimides [40,41], porphyrin [42], pyridinium salt [43], rhodamine with inner salt [44], quinacridone tethered with sodium sulfonate [45], triphenylamine-uorene core featuring a phosphonate side chain [46], tetra-n-alkyl ammonium bromides [47], and metallophthalocyanine (MPc) derivative [48,49].…”