Judicious selection of a pinhole defect filler to generally enhance the performance of organic dye-sensitized solar cells

Abstract

An effective strategy of filling the pinhole defects of organic dyegrafted titania films via judicious selection of a filler as well as its bath solvent has been proposed to generally attenuate the interfacial charge recombination kinetics, bringing forth improved photovoltage, photocurrent and efficiency of organic dye-sensitized solar cells employing non-corrosive cobalt redox electrolytes.

Electron‐Acceptor‐Dependent Light Absorption, Excited‐State Relaxation, and Charge Generation in Triphenylamine Dye‐Sensitized Solar Cells

“…This could be rationalized on the basis of a C264 LUMO energy that is lower by 200 meV and thus a reduced driving force. [17][18][19][20][21][22] Charge-collection yields for the cells studied herein are close to unity and the measured J sc is in approximate proportion to the flux of carrier photogeneration. This could be rationalized according to the theoretically calculated energy losses of 0.43 eV for G221 and 0.40 eV for C264 during excited-state equilibration.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Considerable advances in power-conversion efficiencies (PCEs) have been achieved in the past decade, mainly by logically conjugating electron-rich and electron-deficient segments and rationally modulating non-photoactive auxiliary moieties. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Considerable advances in power-conversion efficiencies (PCEs) have been achieved in the past decade, mainly by logically conjugating electron-rich and electron-deficient segments and rationally modulating non-photoactive auxiliary moieties.…”

“…In the past decade intense research interest in dye-sensitized solar cells (DSCs) has prompted the development of donor-acceptor (D-A) organic dyes, primarily owing to abundant raw materials, versatile molecular design, and diverse colors. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Considerable advances in power-conversion efficiencies (PCEs) have been achieved in the past decade, mainly by logically conjugating electron-rich and electron-deficient segments and rationally modulating non-photoactive auxiliary moieties. In the former aspect, cyanoacrylic acid (CA) was utilized as the electron acceptor for a large portion of numerous organic DSC dyes so far.…”

A Low‐Energy‐Gap Thienochrysenocarbazole Dye for Highly Efficient Mesoscopic Titania Solar Cells: Understanding the Excited State and Charge Carrier Dynamics

“…[1] Somer uthenium complexes with polypyridine ligands [2][3][4][5] and zinc complexes with porphyrin ligands [6][7][8][9][10][11][12] have been widely employed as light-absorbing components in DSSCs.H owever, the scarcity of ruthenium and the poor stability of zinc porphyrin dyes [13] have prevented their widespread practical application.B ecause of the high abundance of raw materials, easy structure manipulation, ands uitable optical properties, metal-free organic dyes have stimulated al ot of research interest. [23][24][25] Interfacial charge recombination determines the free energy of electrons that flow to the external circuit, which is essentially related to the magnitude of the open-circuit photovoltage. However,t his technological process is quite complicated.…”

Titanium Dioxide Modifications for Energy Conversion: Learnings from Dye-Sensitized Solar Cells

“…Effect of long alkyl chain on enhancing electron lifetime in TiO 2 was already known in conjunction with DSC sensitizers [129][130][131]. However, Hanaya et al popularized the concept of "alkyl thicket" as an insulating barrier layer to block unwanted electron recombinations at TiO 2 .…”