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

Liang, Ru-Ze; Babics, Maxime; Savikhin, Victoria; Zhang, Weimin; Le Corre, Vincent M.; Lopatin, Sergei; Kan, Zhipeng; Firdaus, Yuliar; Liu, Shengjian; McCulloch, Iain; Toney, Michael F.; Beaujuge, Pierre M.

doi:10.1002/aenm.201800264

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

Journal Article · Tue Apr 03 00:00:00 EDT 2018 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201800264· OSTI ID:1462359

Liang, Ru-Ze ^[1]; Babics, Maxime ^[1]; Savikhin, Victoria ^[2]; Zhang, Weimin ^[1]; Le Corre, Vincent M. ^[1]; Lopatin, Sergei ^[3]; Kan, Zhipeng ^[1]; Firdaus, Yuliar ^[1]; Liu, Shengjian ^[1]; McCulloch, Iain ^[1]; Toney, Michael F. ^[4]; Beaujuge, Pierre M. ^[1]

KAUST Solar Center (KSC), Thuwal (Saudi Arabia). Physical Sciences and Engineering Division
Stanford Univ., CA (United States). Electrical Engineering Dept.; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia). Imaging and Characterization Core Lab.
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource

Abstract 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 report, 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. 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 rate constant k to <10 ⁻¹² cm ³ s ⁻¹ .

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); KAUST Solar Center (KSC), Thuwal (Saudi Arabia); King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); King Abdullah Univ. of Science and Technology (KAUST) Office of Sponsored Research (OSR) (Saudi Arabia)

Grant/Contract Number:: AC02-76SF00515; CRG_R2_13_BEAU_KAUST_1; DE‐AC02‐76SF00515

OSTI ID:: 1462359

Alternate ID(s):: OSTI ID: 1431141

Journal Information:: Advanced Energy Materials, Vol. 8, Issue 19; ISSN 1614-6832

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 63 works

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14 SOLAR ENERGY
carrier recombination
charge transport
nonfullerene acceptors
small molecule solar cells
solvent vapor annealing

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

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