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Title: Carrier Transport and Recombination in Efficient “All-Small-Molecule” Solar Cells with the Nonfullerene Acceptor IDTBR

Reaching device efficiencies that can rival those of polymer-fullerene Bulk Heterojunction (BHJ) solar cells (>10%) remains challenging with the “All-Small-Molecule” (All-SM) approach, in part because of (i) the morphological limitations that prevail in the absence of polymer and (ii) the difficulty to raise and balance out carrier mobilities across the active layer. In this paper, the authors show that blends of the SM donor DR3TBDTT (DR3) and the nonfullerene SM acceptor O-IDTBR are conducive to “All-SM” BHJ solar cells with high open-circuit voltages (V OC) >1.1 V and PCEs as high as 6.4% (avg. 6.1%) when the active layers are subjected to a post-processing solvent vapor-annealing (SVA) step with dimethyl disulfide (DMDS). Combining electron energy loss spectroscopy (EELS) analyses and systematic carrier recombination examinations, the authors show that SVA treatments with DMDS play a determining role in improving charge transport and reducing non-geminate recombination for the DR3:O-IDTBR system. Finally, correlating the experimental results and device simulations, it is found that substantially higher BHJ solar cell efficiencies of >12% can be achieved if the IQE and carrier mobilities of the active layer are increased to >85% and >10 -4 cm 2 V -1 s -1, respectively, while suppressing the recombination ratemore » constant k to <10 -12 cm 3 s -1.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [1] ;  [1] ;  [1] ;  [4] ;  [1]
  1. KAUST Solar Center (KSC), Thuwal (Saudi Arabia). Physical Sciences and Engineering Division
  2. Stanford Univ., CA (United States). Electrical Engineering Dept.; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
  3. King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia). Imaging and Characterization Core Lab.
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
Publication Date:
Grant/Contract Number:
AC02-76SF00515; CRG_R2_13_BEAU_KAUST_1
Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 8; Journal Issue: 19; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States); KAUST Solar Center (KSC), Thuwal (Saudi Arabia); King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); King Abdullah Univ. of Science and Technology (KAUST) Office of Sponsored Research (OSR) (Saudi Arabia)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; carrier recombination; charge transport; nonfullerene acceptors; small molecule solar cells; solvent vapor annealing
OSTI Identifier:
1462359
Alternate Identifier(s):
OSTI ID: 1431141