Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 9, Pages 9190-9197Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c01539
Keywords
CELIV; organic solar cells; charge transport; charge-carrier mobility; non-fullerene acceptors; ZnO
Funding
- Jane & Aatos Erkko Foundation (project ASPIRE)
- Vilho, Yrjo and Kalle Vaisala Foundation
- Society of Swedish Literature in Finland
- Academy of Finland [326000]
- Inter-Governmental International Cooperation Projects of Science and Technology Commission of Shanghai Municipality (STCSM) [17520710100]
- Academy of Finland (AKA) [326000, 326000] Funding Source: Academy of Finland (AKA)
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The field of organic solar cells has recently gained broad research interest due to the introduction of non-fullerene small-molecule acceptors. The rapid improvement in solar cell efficiency put increased demand on moving toward scalable device architectures. An essential step toward this is enabling thicker active layers for which the hole and electron mobilities and their ratio become increasingly important. In this work, we demonstrate selective charge-carrier mobility determination using the charge extraction by a linearly increasing voltage (CELIV) method. By tuning the contact properties of the solar cell diodes, the hole and electron mobilities are determined separately using the recently developed metal-intrinsic semiconductor-metal-CELIV (MIM-CELIV) technique. Balanced mobility is measured both in non-fullerene and in ternary blends with the recently published PBBF11 polymer. The mobility results are confirmed using the well-established metal-insulator-semiconductor (MIS) and photo-CELIV techniques.
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