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Title: Higher Mobility and Carrier Lifetimes in Solution-Processable Small-Molecule Ternary Solar Cells with 11% Efficiency

Abstract

Solution–processed small molecule (SM) solar cells have the prospect to outperform their polymer–fullerene counterparts. Considering that both SM donors/acceptors absorb in visible spectral range, higher expected photocurrents should in principle translate into higher power conversion efficiencies (PCEs). However, limited bulk–heterojunction (BHJ) charge carrier mobility (<10 –4 cm 2 V –1 s –1) and carrier lifetimes (<1 µs) often impose active layer thickness constraints on BHJ devices (≈100 nm), limiting external quantum efficiencies (EQEs) and photocurrent, and making large–scale processing techniques particularly challenging. In this report, it is shown that ternary BHJs composed of the SM donor DR3TBDTT (DR3), the SM acceptor ICC6 and the fullerene acceptor PC71BM can be used to achieve SM–based ternary BHJ solar cells with active layer thicknesses >200 nm and PCEs nearing 11%. The examinations show that these remarkable figures are the result of i) significantly improved electron mobility (8.2 × 10 –4 cm 2 V –1 s –1), ii) longer carrier lifetimes (2.4 µs), and iii) reduced geminate recombination within BHJ active layers to which PC 71BM has been added as ternary component. As a result, optically thick (up to ≈500 nm) devices are shown to maintain PCEs >8%, and optimized DR3:ICC6:PC 71BM solar cellsmore » demonstrate long–term shelf stability (dark) for >1000 h, in 55% humidity air environment.« less

Authors:
ORCiD logo [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [3];  [1];  [1]
  1. King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia)
  2. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1506958
Alternate Identifier(s):
OSTI ID: 1488622
Grant/Contract Number:  
CRG_R2_13_BEAU_KAUST_1; AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 9; Journal Issue: 7; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; nonfullerene acceptors; organic photovoltaics; small molecule; solvent vapor annealing; ternary solar cells

Citation Formats

Liang, Ru -Ze, Zhang, Yiming, Savikhin, Victoria, Babics, Maxime, Kan, Zhipeng, Wohlfahrt, Markus, Wehbe, Nimer, Liu, Shengjian, Duan, Tainan, Toney, Michael F., Laquai, Frédéric, and Beaujuge, Pierre M. Higher Mobility and Carrier Lifetimes in Solution-Processable Small-Molecule Ternary Solar Cells with 11% Efficiency. United States: N. p., 2018. Web. doi:10.1002/aenm.201802836.
Liang, Ru -Ze, Zhang, Yiming, Savikhin, Victoria, Babics, Maxime, Kan, Zhipeng, Wohlfahrt, Markus, Wehbe, Nimer, Liu, Shengjian, Duan, Tainan, Toney, Michael F., Laquai, Frédéric, & Beaujuge, Pierre M. Higher Mobility and Carrier Lifetimes in Solution-Processable Small-Molecule Ternary Solar Cells with 11% Efficiency. United States. doi:10.1002/aenm.201802836.
Liang, Ru -Ze, Zhang, Yiming, Savikhin, Victoria, Babics, Maxime, Kan, Zhipeng, Wohlfahrt, Markus, Wehbe, Nimer, Liu, Shengjian, Duan, Tainan, Toney, Michael F., Laquai, Frédéric, and Beaujuge, Pierre M. Thu . "Higher Mobility and Carrier Lifetimes in Solution-Processable Small-Molecule Ternary Solar Cells with 11% Efficiency". United States. doi:10.1002/aenm.201802836. https://www.osti.gov/servlets/purl/1506958.
@article{osti_1506958,
title = {Higher Mobility and Carrier Lifetimes in Solution-Processable Small-Molecule Ternary Solar Cells with 11% Efficiency},
author = {Liang, Ru -Ze and Zhang, Yiming and Savikhin, Victoria and Babics, Maxime and Kan, Zhipeng and Wohlfahrt, Markus and Wehbe, Nimer and Liu, Shengjian and Duan, Tainan and Toney, Michael F. and Laquai, Frédéric and Beaujuge, Pierre M.},
abstractNote = {Solution–processed small molecule (SM) solar cells have the prospect to outperform their polymer–fullerene counterparts. Considering that both SM donors/acceptors absorb in visible spectral range, higher expected photocurrents should in principle translate into higher power conversion efficiencies (PCEs). However, limited bulk–heterojunction (BHJ) charge carrier mobility (<10–4 cm2 V–1 s–1) and carrier lifetimes (<1 µs) often impose active layer thickness constraints on BHJ devices (≈100 nm), limiting external quantum efficiencies (EQEs) and photocurrent, and making large–scale processing techniques particularly challenging. In this report, it is shown that ternary BHJs composed of the SM donor DR3TBDTT (DR3), the SM acceptor ICC6 and the fullerene acceptor PC71BM can be used to achieve SM–based ternary BHJ solar cells with active layer thicknesses >200 nm and PCEs nearing 11%. The examinations show that these remarkable figures are the result of i) significantly improved electron mobility (8.2 × 10–4 cm2 V–1 s–1), ii) longer carrier lifetimes (2.4 µs), and iii) reduced geminate recombination within BHJ active layers to which PC71BM has been added as ternary component. As a result, optically thick (up to ≈500 nm) devices are shown to maintain PCEs >8%, and optimized DR3:ICC6:PC71BM solar cells demonstrate long–term shelf stability (dark) for >1000 h, in 55% humidity air environment.},
doi = {10.1002/aenm.201802836},
journal = {Advanced Energy Materials},
issn = {1614-6832},
number = 7,
volume = 9,
place = {United States},
year = {2018},
month = {12}
}

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