Premium
Nonfullerene organic photovoltaic cells exhibiting 13.76% efficiency by employing upside‐down solvent vapor annealing
Author(s) -
Jiao Chaoqun,
Pang Chengzong,
An Qiaoshi
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4870
Subject(s) - annealing (glass) , organic solar cell , active layer , energy conversion efficiency , materials science , solvent , photovoltaic system , acceptor , exciton , chemical engineering , optoelectronics , analytical chemistry (journal) , nanotechnology , polymer , chemistry , organic chemistry , layer (electronics) , composite material , electrical engineering , physics , engineering , condensed matter physics , quantum mechanics , thin film transistor
Summary Organic photovoltaic cells (OPVs) are fabricated with a polymer donor PM7 and a nonfullerene acceptor IT‐4Cl; the morphology of active layers is optimized by employing upside‐down solvent vapor annealing (UD‐SVA) method with different annealing solvents. The OPVs with CS 2 as annealing solvent exhibit optimized power conversion efficiency (PCE) of 13.76%, with simultaneously increased short‐circuit current density ( J SC ) of 20.53 mA cm −2 and fill factor (FF) of 77.05%. More than 15% PCE improvement can be achieved by employing CS 2 UD‐SVA treatment, which should be attributed to slightly enhanced photon harvesting, efficient exciton separation, charge transport, and collection, resulting from the well‐developed morphology of active layer. Moreover, the PM7:IT‐4Cl–based OPVs with CS 2 as annealing solvent still can maintain PCE more than 13% in a wide treatment time range from 20 to 90 seconds. This work demonstrated that UD‐SVA has great potential in improving the performance of nonfullerene OPVs.