The Importance of Entanglements in Optimizing the Mechanical and Electrical Performance of All-Polymer Solar CellsClick to copy article linkArticle link copied!
- Nrup BalarNrup BalarDepartment of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695, United StatesMore by Nrup Balar
- Jeromy James RechJeromy James RechDepartment of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United StatesMore by Jeromy James Rech
- Reece HenryReece HenryDepartment of Physics, North Carolina State University, Raleigh, North Carolina 27695, United StatesMore by Reece Henry
- Long YeLong YeDepartment of Physics, North Carolina State University, Raleigh, North Carolina 27695, United StatesMore by Long Ye
- Harald AdeHarald AdeDepartment of Physics, North Carolina State University, Raleigh, North Carolina 27695, United StatesMore by Harald Ade
- Wei YouWei YouDepartment of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United StatesMore by Wei You
- Brendan T. O’Connor*Brendan T. O’Connor*E-mail: [email protected]Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695, United StatesMore by Brendan T. O’Connor
Abstract
![Abstract Image](/cms/10.1021/acs.chemmater.9b01011/asset/images/medium/cm-2019-010116_0002.gif)
Organic solar cells that have all-polymer active layers may have several advantages compared with polymer–small molecule systems including improved mechanical and thermodynamic stability; however, an all-polymer active layer does not guarantee robust mechanical behavior. Here, we consider key parameters that may influence the mechanical behavior and power conversion efficiency of all-polymer solar cells (all-PSCs). Considerations include the thermal transition temperature of the polymers, the molecular weight (MW) of the polymers, and film morphology. The impact these features have on mechanical behavior is probed by measuring the cohesive fracture energy (Gc), crack onset strain, and elastic modulus. We find that the selection of ductile polymers with high MW enhances interchain interactions that improve the mechanical resilience of the films. High-MW polymers are also found to maximize the power conversion efficiency (PCE). Using this strategy, BHJ films with the best reported combination of Gc (7.96 J m–2) and PCE (6.94%) are demonstrated. Finally, it is found that increasing the film thickness increases the fracture energy of the films but at the cost of PCE. These findings provide a fundamental perspective on the design strategy to achieve high performance and mechanically robust organic solar cells.
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