All‐Polymer Bulk Heterojuction Solar Cells with 4.8% Efficiency Achieved by Solution Processing from a Co‐Solvent

Abstract

All-polymer solar cells with 4.8% power conversion efficiency are achieved via solution processing from a co-solvent. The observed short-circuit current density of 10.5 mA cm(-2) and external quantum efficiency of 61.3% are also the best reported in all-polymer solar cells so far. The results demonstrate that processing the active layer from a co-solvent is an important strategy in achieving highly efficient all-polymer solar cells.

Dynamics, Miscibility, and Morphology in Polymer:Molecule Blends: The Impact of Chemical Functionality

“…Although the range of R g is narrow for our blends owing to the computationally-limited short chains, the trends are apparent and expected to become more pronounced when longer chains and larger system sizes are 26 modeled. Extended chains in the blend morphology can be more favorable in solar-cell operation as they can bridge segregated ordered domains as "tie-chains," and facilitate more efficient pathways for charge carriers to reach electrodes.…”

“…[14][15][16][17][18][19][20][21][22][23][24][25][26][27] Having a greater selection of donor:acceptor pairs can improve our basic understanding of how features in chemical structure affect each device characteristic, and in particular the formation of the BHJ morphology. Representative nonfullerene acceptors include naphthalene 18 and perylene 19 diimides, oligothiophenes, diketopyrrolopyrroles, vinazenes, rhodamines, and substituted pentacenes.…”

“…These strategies are generating increased success, as power conversion efficiencies (PCE) over 7% have now been achieved in polymer:molecule and all-polymer BHJ OPVs. [20][21][22][23][24][25][26][28][29] It is well demonstrated that slight modifications in the chemical structure of organic electronic materials can lead to major changes in pristine and blend film morphologies and their subsequent performance. Of particular relevance to this study is previous work by Shu and co-workers, who surveyed a variety of electron-deficient pentacenes as acceptors in BHJ devices with poly(3-hexylthiophene) [P3HT] acting as the donor material.…”

Green‐Solvent‐Processed All‐Polymer Solar Cells Containing a Perylene Diimide‐Based Acceptor with an Efficiency over 6.5%

“…[ 30 ] Several reports demonstrated that the elaborate selection of processing solvents is an effi cient method in realizing favorable morphologies in All-PSCs. [31][32][33][34][35] In 2011, Tajima and co-workers introduced solvent mixtures based on toluene and o -xylene as processing solvents to fabricate PDI polymer-based All-PSCs that achieved higher PCEs relative to those of devices utilizing conventional solvents, such as chlorobenzene (CB), produced in parallel. [ 35 ] Although an optimistic trend emerged in this work, the achieved PCEs (≈2%) still remained low at that time.…”

The effect of processing additives for charge generation, recombination, and extraction in bulk heterojunction layers of all-polymer photovoltaics

“…By mixing a few volume percent of processing additives with the host solvent, dichlorobenzene (DCB) or chlorobenzene, the efficiencies of many polymers can be improved dramatically. 11,12 According to these works, it can be concluded that crystallinity as well as domain size in the blends can be tuned effectively by using solvent additive mixtures. Thus, processing additives play an important role in high performance solar cells.…”