Unraveling the Morphological Evolutions during Solvent Vapor Annealing for Organic Solar Cells Using in situ Resonant Soft X-Ray Scattering
POSTER
Abstract
Solvent vapor annealing (SVA) is one of the most effective pre-electrode deposition techniques, which has been applied in many efficient organic solar cells. In current research, we used a customized in situ multimodal system to reveal the dynamics of phase separation inside the bulk-heterojunction thin films during SVA via resonant soft x-ray scattering (RSoXS). Solvent-vapor-induced molecular crystallization is of importance to provide the driving force of the domain generation and evolution processes. However, with the introduction of solvent vapor for a long time, coarsening of the film appeared at the film surface, which led to the deteriorating of the device performances. These results indicated that in situ RSoXS is a quite useful technique to bridge the gap to understand the relationship of film growth mechanisms and device efficiency.
Presenters
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Wenkai Zhong
Lawrence Berkeley National Laboratory
Authors
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Wenkai Zhong
Lawrence Berkeley National Laboratory
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Isvar Cordova
Lawrence Berkeley National Laboratory, MSD, Lawrence Berkeley National Lab
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Yufeng Jiang
University of California, Berkeley, Lawrence Berkeley National Laboratory
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Cheng Wang
Lawrence Berkeley National Laboratory, ALS, Lawrence Berkeley National Lab
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Feng Liu
Shanghai Jiaotong University
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Thomas Russell
Univ of Mass - Amherst, Polymer Science and Engineering, University of Massachusetts Amherst, Lawrence Berkeley National Laboratory, Polymer Science and Engineering Department, UMass