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Title: Understanding the Interplay of Transport-Morphology-Performance in PBDB-T Based Polymer Solar Cells

Journal Article · · Solar RRL
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  1. Soochow Univ., Suzhou (China)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of Yangon (Myanmar)
  5. King Mongkut's Univ. of Technology Thonburi, Bangkok (Thailand)

Polymer-polymer blends have been reported to show exceptional thermal and ambient stability. However, power conversion efficiencies (PCEs) from devices using polymeric acceptors have been recorded to be significantly lower than those based on conjugated molecular acceptors. Here, two organic nonfullerene bulk heterojunction (BHJ) blends ITIC:PBDB-T and N2200:PBDB-T, together with their fullerene counterpart, PCBM:PBDB-T, are adopted to understand the effect of electron acceptors on device performance. We comprehensively investigate free charge carrier properties using time-resolved microwave conductivity (TRMC) measurements. The nonfullerene devices show an improved PCE of 10.06% and 6.65% in the ITIC and N2200 based cells, respectively. In comparison, the PCBM: PBDB-T based devices yielded a PCE of 5.88%. The optimal N2200: PBDB-T produced the highest TRMC mobility, longest lifetime, and greatest free carrier diffusion length. We found that such phenomena can be associated with the unfavorable morphology of the all-polymer BHJ microstructure. In contrast, the solar cell using either the PCBM or ITIC acceptors display a more balanced donor and acceptor phase separation, leading to more efficient free carrier separation and transport in an operating device. Sacrificing efficiency for superior stability, we show that the improved structure in all-polymer blend could deliver a more stable morphology under thermal stress.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC36-08GO28308; AC02-05CH11231
OSTI ID:
1593692
Alternate ID(s):
OSTI ID: 1775376
Report Number(s):
NREL/JA-5900-75202; {"Journal ID: ISSN 2367-198X",MainAdminID:5170,UUID:637bfb9b-99ef-e911-9c29-ac162d87dfe5,MainId:16692}
Journal Information:
Solar RRL, Journal Name: Solar RRL Journal Issue: 4 Vol. 4; ISSN 2367-198X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

References (51)

High Performance All-Polymer Solar Cells by Synergistic Effects of Fine-Tuned Crystallinity and Solvent Annealing journal August 2016
Simultaneously Improved Efficiency and Stability in All-Polymer Solar Cells by a P–i–N Architecture journal August 2019
Aggregation‐Induced Multilength Scaled Morphology Enabling 11.76% Efficiency in All‐Polymer Solar Cells Using Printing Fabrication journal August 2019
Molecular Design of Benzodithiophene-Based Organic Photovoltaic Materials journal June 2016
An Electron Acceptor Challenging Fullerenes for Efficient Polymer Solar Cells journal January 2015
Material insights and challenges for non-fullerene organic solar cells based on small molecular acceptors journal July 2018
Next-generation organic photovoltaics based on non-fullerene acceptors journal February 2018
Recent Advances, Design Guidelines, and Prospects of All-Polymer Solar Cells journal June 2019
Conjugated Polymer Photovoltaic Materials with Broad Absorption Band and High Charge Carrier Mobility journal August 2008
Polymer–Fullerene Composite Solar Cells journal January 2008
11.2% All-Polymer Tandem Solar Cells with Simultaneously Improved Efficiency and Stability journal July 2018
Optimisation of processing solvent and molecular weight for the production of green-solvent-processed all-polymer solar cells with a power conversion efficiency over 9% journal January 2017
Polymer Photovoltaic Cells: Enhanced Efficiencies via a Network of Internal Donor-Acceptor Heterojunctions journal December 1995
High efficiency all-polymer solar cells realized by the synergistic effect between the polymer side-chain structure and solvent additive journal January 2015
Ambient Processable and Stable All-Polymer Organic Solar Cells journal January 2019
Aggregation and morphology control enables multiple cases of high-efficiency polymer solar cells journal November 2014
Single-Junction Organic Solar Cell with over 15% Efficiency Using Fused-Ring Acceptor with Electron-Deficient Core journal April 2019
Processing Additives for Improved Efficiency from Bulk Heterojunction Solar Cells journal March 2008
Polymer donor–polymer acceptor (all-polymer) solar cells journal April 2013
Engineering the morphology via processing additives in multiple all-polymer solar cells for improved performance journal January 2018
Quantitative Determination of Organic Semiconductor Microstructure from the Molecular to Device Scale journal June 2012
Engineering the morphology via processing additives in multiple all-polymer solar cells for improved performance journal January 2018
High-Performance and Stable All-Polymer Solar Cells Using Donor and Acceptor Polymers with Complementary Absorption journal March 2017
High efficiency all-polymer solar cells realized by the synergistic effect between the polymer side-chain structure and solvent additive journal January 2015
Space-Charge-Limited Currents in Solids journal March 1955
Space-Charge-Limited Currents in Solids journal March 1955
Stability/degradation of polymer solar cells journal July 2008
Elucidating the Long-range Charge Carrier Mobility in Metal Halide Perovskite Thin Films conference February 2019
Bulk Heterojunction Solar Cells: Morphology and Performance Relationships journal May 2014
High-efficiency and air-stable P3HT-based polymer solar cells with a new non-fullerene acceptor journal June 2016
Inter-Fullerene Electronic Coupling Controls the Efficiency of Photoinduced Charge Generation in Organic Bulk Heterojunctions journal September 2016
Correlated Donor/Acceptor Crystal Orientation Controls Photocurrent Generation in All-Polymer Solar Cells journal April 2014
Synthesis of Conjugated Polymers for Organic Solar Cell Applications journal November 2009
Elucidating the long-range charge carrier mobility in metal halide perovskite thin films text January 2018
Organic solar cells based on non-fullerene acceptors. text January 2018
Single-junction polymer solar cells with high efficiency and photovoltage journal February 2015
Organic solar cells based on non-fullerene acceptors journal January 2018
Promoting Morphology with a Favorable Density of States Using Diiodooctane to Improve Organic Photovoltaic Device Efficiency and Charge Carrier Lifetimes journal June 2017
Thermally Stable All-Polymer Solar Cells with High Tolerance on Blend Ratios journal March 2018
A high-mobility electron-transporting polymer for printed transistors journal January 2009
Fullerene-Free Polymer Solar Cells with over 11% Efficiency and Excellent Thermal Stability journal April 2016
Optimisation of processing solvent and molecular weight for the production of green-solvent-processed all-polymer solar cells with a power conversion efficiency over 9% journal January 2017
Elucidating the long-range charge carrier mobility in metal halide perovskite thin films journal January 2019
Comparing the device physics, dynamics and morphology of polymer solar cells employing conventional PCBM and non-fullerene polymer acceptor N2200 journal May 2017
Elucidating the long-range charge carrier mobility in metal halide perovskite thin films journal January 2019
Molecular Design of Photovoltaic Materials for Polymer Solar Cells: Toward Suitable Electronic Energy Levels and Broad Absorption journal January 2012
Over 16% efficiency organic photovoltaic cells enabled by a chlorinated acceptor with increased open-circuit voltages journal June 2019
Flexible, highly efficient all-polymer solar cells journal October 2015
Molecular Optimization Enables over 13% Efficiency in Organic Solar Cells journal May 2017
Charge carrier recombination in organic solar cells journal December 2013
Organic solar cells based on non-fullerene acceptors. text January 2018