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

Journal Article · · Advanced Energy Materials
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)

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 PC 71 BM 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 71 BM has been added as ternary component. Optically thick (up to ≈500 nm) devices are shown to maintain PCEs >8%, and optimized DR3:ICC6:PC 71 BM solar cells demonstrate long‐term shelf stability (dark) for >1000 h, in 55% humidity air environment.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
CRG_R2_13_BEAU_KAUST_1; AC02-76SF00515; DE‐AC02‐76SF00515
OSTI ID:
1506958
Alternate ID(s):
OSTI ID: 1488622
Journal Information:
Advanced Energy Materials, Vol. 9, Issue 7; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

References (70)

A High-Performing Solution-Processed Small Molecule:Perylene Diimide Bulk Heterojunction Solar Cell journal June 2013
Comparison of the Morphology Development of Polymer-Fullerene and Polymer-Polymer Solar Cells during Solution-Shearing Blade Coating journal August 2016
Ternary blend polymer solar cells with enhanced power conversion efficiency journal August 2014
Impact of interfacial molecular orientation on radiative recombination and charge generation efficiency journal July 2017
Nonfullerene-Acceptor All-Small-Molecule Organic Solar Cells Based on Highly Twisted Perylene Bisimide with an Efficiency of over 6% journal January 2017
Recent advances in organic ternary solar cells journal January 2017
Versatile ternary organic solar cells: a critical review journal January 2016
Triperylene Hexaimides Based All‐Small‐Molecule Solar Cells with an Efficiency over 6% and Open Circuit Voltage of 1.04 V journal November 2016
Interplay Between Side Chain Pattern, Polymer Aggregation, and Charge Carrier Dynamics in PBDTTPD:PCBM Bulk-Heterojunction Solar Cells journal January 2015
Efficient inverted polymer solar cells employing favourable molecular orientation journal May 2015
Comparison of the Operation of Polymer/Fullerene, Polymer/Polymer, and Polymer/Nanocrystal Solar Cells: A Transient Photocurrent and Photovoltage Study journal March 2011
High-efficiency and air-stable P3HT-based polymer solar cells with a new non-fullerene acceptor journal June 2016
Solvent Annealing Effects in Dithieno[3,2- b :2′,3′- d ]pyrrole–5,6-Difluorobenzo[ c ][1,2,5]thiadiazole Small Molecule Donors for Bulk-Heterojunction Solar Cells journal July 2016
Morphology changes upon scaling a high-efficiency, solution-processed solar cell journal January 2016
Polymer/Small Molecule/Fullerene Based Ternary Solar Cells journal April 2017
Highly efficient and thermally stable fullerene-free organic solar cells based on a small molecule donor and acceptor journal January 2016
Semi-crystalline photovoltaic polymers with efficiency exceeding 9% in a ∼300 nm thick conventional single-cell device journal January 2014
Optimization of monochromated TEM for ultimate resolution imaging and ultrahigh resolution electron energy loss spectroscopy journal January 2018
Recent progress in non-fullerene small molecule acceptors in organic solar cells (OSCs) journal January 2017
All-small-molecule organic solar cells based on an electron donor incorporating binary electron-deficient units journal January 2016
Efficient organic solar cells processed from hydrocarbon solvents journal January 2016
Carrier Transport and Recombination in Efficient “All-Small-Molecule” Solar Cells with the Nonfullerene Acceptor IDTBR journal April 2018
High-Performance Ternary Organic Solar Cell Enabled by a Thick Active Layer Containing a Liquid Crystalline Small Molecule Donor journal February 2017
Additive-Morphology Interplay and Loss Channels in “All-Small-Molecule” Bulk-heterojunction (BHJ) Solar Cells with the Nonfullerene Acceptor IDTTBM journal December 2017
High-efficiency small-molecule ternary solar cells with a hierarchical morphology enabled by synergizing fullerene and non-fullerene acceptors journal September 2018
Polymer solar cells with enhanced fill factors journal August 2013
Recombination Dynamics as a Key Determinant of Open Circuit Voltage in Organic Bulk Heterojunction Solar Cells: A Comparison of Four Different Donor Polymers journal August 2010
Non-Fullerene Electron Acceptors for Use in Organic Solar Cells journal October 2015
Recombination in polymer-fullerene bulk heterojunction solar cells journal December 2010
Highly oriented crystals at the buried interface in polythiophene thin-film transistors journal February 2006
Aggregation and morphology control enables multiple cases of high-efficiency polymer solar cells journal November 2014
Effects of Solvent Additives on Morphology, Charge Generation, Transport, and Recombination in Solution-Processed Small-Molecule Solar Cells journal January 2014
Morphology evolution via self-organization and lateral and vertical diffusion in polymer:fullerene solar cell blends journal January 2008
High-Performance Organic Solar Cells Based on a Small Molecule with Alkylthio-Thienyl-Conjugated Side Chains without Extra Treatments journal October 2015
Solution-Processed and High-Performance Organic Solar Cells Using Small Molecules with a Benzodithiophene Unit journal May 2013
Understanding the morphology of solution processed fullerene-free small molecule bulk heterojunction blends journal January 2016
Structural Origins for Tunable Open-Circuit Voltage in Ternary-Blend Organic Solar Cells journal August 2015
Ternary solar cells with a mixed face-on and edge-on orientation enable an unprecedented efficiency of 12.1% journal January 2017
25th Anniversary Article: Bulk Heterojunction Solar Cells: Understanding the Mechanism of Operation journal December 2013
Schematic Studies on the Structural Properties and Device Physics of All Small Molecule Ternary Photovoltaic Cells journal September 2015
Status and prospects for ternary organic photovoltaics journal July 2015
Film morphology evolution during solvent vapor annealing of highly efficient small molecule donor/acceptor blends journal January 2016
Competition between recombination and extraction of free charges determines the fill factor of organic solar cells journal May 2015
A molecular nematic liquid crystalline material for high-performance organic photovoltaics journal January 2015
Solution-processed small-molecule solar cells with 6.7% efficiency journal November 2011
High performance all-small-molecule solar cells: engineering the nanomorphology via processing additives journal January 2016
Tuning the optoelectronic properties for high-efficiency (>7.5%) all small molecule and fullerene-free solar cells journal January 2017
Benzo[1,2- b :4,5- b ′]dithiophene–Pyrido[3,4- b ]pyrazine Small-Molecule Donors for Bulk Heterojunction Solar Cells journal February 2016
Ternary Organic Solar Cells with >11% Efficiency Incorporating Thick Photoactive Layer and Nonfullerene Small Molecule Acceptor journal September 2017
Panchromatic Sequentially Cast Ternary Polymer Solar Cells journal November 2016
Benzo[1,2- b :4,5- b ′]Dithiophene-6,7-Difluoroquinoxaline Small Molecule Donors with >8% BHJ Solar Cell Efficiency journal July 2017
Reducing the efficiency–stability–cost gap of organic photovoltaics with highly efficient and stable small molecule acceptor ternary solar cells journal November 2016
Trap-Induced Losses in Hybrid Photovoltaics journal March 2014
High-performance ternary blend polymer solar cells involving both energy transfer and hole relay processes journal June 2015
Small is Powerful: Recent Progress in Solution-Processed Small Molecule Solar Cells journal January 2017
Achieving Highly Efficient Nonfullerene Organic Solar Cells with Improved Intermolecular Interaction and Open-Circuit Voltage journal March 2017
A Facile Planar Fused-Ring Electron Acceptor for As-Cast Polymer Solar Cells with 8.71% Efficiency journal February 2016
Unique Reversible Crystal-to-Crystal Phase Transition—Structural and Functional Properties of Fused Ladder Thienoarenes journal September 2017
On the Efficiency Limit of Conjugated Polymer:Fullerene-Based Bulk Heterojunction Solar Cells journal January 2016
Highly crystalline low-bandgap polymer nanowires towards high-performance thick-film organic solar cells exceeding 10% power conversion efficiency journal January 2017
Linear Side Chains in Benzo[1,2- b :4,5- b ′]dithiophene–Thieno[3,4- c ]pyrrole-4,6-dione Polymers Direct Self-Assembly and Solar Cell Performance journal March 2013
Solution-Processed Organic Solar Cells Based on Dialkylthiol-Substituted Benzodithiophene Unit with Efficiency near 10% journal October 2014
A Series of Simple Oligomer-like Small Molecules Based on Oligothiophenes for Solution-Processed Solar Cells with High Efficiency journal March 2015
Polymer Main-Chain Substitution Effects on the Efficiency of Nonfullerene BHJ Solar Cells journal July 2017
Efficient ternary bulk heterojunction solar cells based on small molecules only journal January 2015
New Wide Band Gap Donor for Efficient Fullerene-Free All-Small-Molecule Organic Solar Cells journal January 2017
Donor and Acceptor Unit Sequences Influence Material Performance in Benzo[1,2- b :4,5- b ′]dithiophene-6,7-Difluoroquinoxaline Small Molecule Donors for BHJ Solar Cells journal August 2016
9.73% Efficiency Nonfullerene All Organic Small Molecule Solar Cells with Absorption-Complementary Donor and Acceptor journal March 2017
Synergistic Effects of Morphological Control and Complementary Absorption in Efficient All-Small-Molecule Ternary-Blend Solar Cells journal September 2015
Panchromatic Sequentially Cast Ternary Polymer Solar Cells text January 2017

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