DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Equally high efficiencies of organic solar cells processed from different solvents reveal key factors for morphology control

Journal Article · · Nature Energy
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5];  [2];  [2];  [2];  [6];  [7];  [2]; ORCiD logo [2]; ORCiD logo [6];  [4]; ORCiD logo [4]; ORCiD logo [8];  [8];  [9]; ORCiD logo [9]; ORCiD logo [3] more »; ORCiD logo [7]; ORCiD logo [7]; ORCiD logo [10]; ORCiD logo [2]; ORCiD logo [1] « less
  1. Linköping University (Sweden)
  2. Soochow University, Suzhou (China)
  3. Jilin Univ., Changchun (China)
  4. Czech Academy of Sciences (CAS), Prague (Czech Republic)
  5. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  6. Univ. of Illinois at Urbana-Champaign, IL (United States)
  7. Univ. of Arizona, Tucson, AZ (United States)
  8. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  9. The Chinese University of Hong Kong, Ma Liu Shui, Shatin (Hong Kong)
  10. Soochow University, Suzhou (China); Chinese Academy of Sciences (CAS), Beijing (China)

The power conversion efficiency of organic solar cells (OSCs) is exceeding 20%, an advance in which morphology optimization has played a significant role. It is generally accepted that the processing solvent (or solvent mixture) can help optimize morphology, impacting the OSC efficiency. Here we develop OSCs that show strong tolerance to a range of processing solvents, with all devices delivering high power conversion efficiencies around 19%. By investigating the solution states, the film formation dynamics and the characteristics of the processed films both experimentally and computationally, we identify the key factors that control morphology, that is, the interactions between the side chains of the acceptor materials and the solvent as well as the interactions between the donor and acceptor materials. Our work provides new understanding on the long-standing question of morphology control and effective guides to design OSC materials towards practical applications, where green solvents are required for large-scale processing.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2497302
Journal Information:
Nature Energy, Journal Name: Nature Energy Vol. 10; ISSN 2058-7546
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

References (53)

Solvent-Induced Morphology in Polymer-Based Systems for Organic Photovoltaics journal July 2011
Low Temperature Aggregation Transitions in N3 and Y6 Acceptors Enable Double‐Annealing Method That Yields Hierarchical Morphology and Superior Efficiency in Nonfullerene Organic Solar Cells journal September 2020
Dual‐Additive‐Driven Morphology Optimization for Solvent‐Annealing‐Free All‐Small‐Molecule Organic Solar Cells journal May 2023
Efficient Polymer Solar Cells Based on a Low Bandgap Semi-crystalline DPP Polymer-PCBM Blends journal June 2012
An Electron Acceptor Challenging Fullerenes for Efficient Polymer Solar Cells journal January 2015
Rational Tuning of Molecular Interaction and Energy Level Alignment Enables High‐Performance Organic Photovoltaics journal September 2019
Resolving Atomic‐Scale Interactions in Nonfullerene Acceptor Organic Solar Cells with Solid‐State NMR Spectroscopy, Crystallographic Modelling, and Molecular Dynamics Simulations journal December 2021
Binary Organic Solar Cells Breaking 19% via Manipulating the Vertical Component Distribution journal July 2022
20.2% Efficiency Organic Photovoltaics Employing a π‐Extension Quinoxaline‐Based Acceptor with Ordered Arrangement journal June 2024
Efficient Organic Solar Cell with 16.88% Efficiency Enabled by Refined Acceptor Crystallization and Morphology with Improved Charge Transfer and Transport Properties journal March 2020
Controlling aggregate formation in conjugated polymers by spin-coating below the critical temperature of the disorder-order transition journal December 2017
Fast Parallel Algorithms for Short-Range Molecular Dynamics journal March 1995
Ultrafast photoinduced electron transfer in conducting polymer—buckminsterfullerene composites journal October 1993
Single-Junction Organic Solar Cell with over 15% Efficiency Using Fused-Ring Acceptor with Electron-Deficient Core journal April 2019
Optimization Requirements of Efficient Polythiophene:Nonfullerene Organic Solar Cells journal June 2020
drtsans: The data reduction toolkit for small-angle neutron scattering at Oak Ridge National Laboratory journal July 2022
Solution Aggregate Structures of Donor Polymers Determine the Morphology and Processing Resiliency of Non-Fullerene Organic Solar Cells journal March 2023
From Solution to Thin Film: Molecular Assembly of π-Conjugated Systems and Impact on (Opto)electronic Properties journal June 2023
Ultrafast Hole Transfer and Carrier Transport Controlled by Nanoscale-Phase Morphology in Nonfullerene Organic Solar Cells journal April 2020
Replacing Alkyl with Oligo(ethylene glycol) as Side Chains of Conjugated Polymers for Close π–π Stacking journal June 2015
Molecular Orientation and Phase Separation by Controlling Chain Segment and Molecule Movement in P3HT/N2200 Blends journal September 2016
To Reveal the Importance of the Crystallization Sequence on Micro-Morphological Structures of All-Crystalline Polymer Blends by In Situ Investigation journal April 2021
Characterization of Biaryl Torsional Energetics and its Treatment in OPLS All-Atom Force Fields journal April 2013
Conjugated Polymer-Based Organic Solar Cells journal April 2007
The OPLS [optimized potentials for liquid simulations] potential functions for proteins, energy minimizations for crystals of cyclic peptides and crambin journal March 1988
Processing Additives for Improved Efficiency from Bulk Heterojunction Solar Cells journal March 2008
Organic Photovoltaics: Understanding the Preaggregation of Polymer Donors in Solution and Its Morphological Impact journal January 2021
Conformational Order in Aggregates of Conjugated Polymers journal May 2015
Three-Dimensional Nanoscale Organization of Bulk Heterojunction Polymer Solar Cells journal February 2009
Efficient photodiodes from interpenetrating polymer networks journal August 1995
Aggregation and morphology control enables multiple cases of high-efficiency polymer solar cells journal November 2014
Efficiency enhancement in low-bandgap polymer solar cells by processing with alkane dithiols journal May 2007
A general relationship between disorder, aggregation and charge transport in conjugated polymers journal August 2013
Reducing the efficiency–stability–cost gap of organic photovoltaics with highly efficient and stable small molecule acceptor ternary solar cells journal November 2016
Long-range exciton diffusion in molecular non-fullerene acceptors journal October 2020
Pseudo-bilayer architecture enables high-performance organic solar cells with enhanced exciton diffusion length journal January 2021
Small reorganization energy acceptors enable low energy losses in non-fullerene organic solar cells journal June 2022
Sub-10-fs observation of bound exciton formation in organic optoelectronic devices journal August 2022
Deuteration-enhanced neutron contrasts to probe amorphous domain sizes in organic photovoltaic bulk heterojunction films journal March 2024
Wide-gap non-fullerene acceptor enabling high-performance organic photovoltaic cells for indoor applications journal August 2019
The role of exciton lifetime for charge generation in organic solar cells at negligible energy-level offsets journal August 2020
A guest-assisted molecular-organization approach for >17% efficiency organic solar cells using environmentally friendly solvents journal November 2021
Origins of the open-circuit voltage in ternary organic solar cells and design rules for minimized voltage losses journal July 2023
Non-fullerene acceptor with asymmetric structure and phenyl-substituted alkyl side chain for 20.2% efficiency organic solar cells journal June 2024
Intrinsic efficiency limits in low-bandgap non-fullerene acceptor organic solar cells journal October 2020
Single-junction organic solar cells with over 19% efficiency enabled by a refined double-fibril network morphology journal May 2022
Dilution effect for highly efficient multiple-component organic solar cells journal December 2021
High-efficiency organic solar cells with low non-radiative recombination loss and low energetic disorder journal January 2020
Tuning the solution aggregation and molecular order for efficient and thermally stable polymer solar cells journal January 2023
Charge separation and photovoltaic conversion in polymer composites with internal donor/acceptor heterojunctions journal October 1995
Tandem organic solar cells with 20.6% efficiency enabled by reduced voltage losses journal March 2023
The suite of small-angle neutron scattering instruments at Oak Ridge National Laboratory journal February 2018
Polymer Photovoltaic Cells: Enhanced Efficiencies via a Network of Internal Donor-Acceptor Heterojunctions journal December 1995