Charge Generation Dynamics in Efficient All-Polymer Solar Cells: Influence of Polymer Packing and Morphology
- Authors
- Gautam, Bhoj R.; Lee, Changyeon; Younts, Robert; Lee, Wonho; Danilov, Evgeny; Kim, Bumjoon J.; Gundogdu, Kenan
- Issue Date
- Dec-2015
- Publisher
- AMER CHEMICAL SOC
- Keywords
- all polymer solar cells; charge generation/recombination; nanomorphology; polymer packing; ultrafast spectroscopy
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.7, no.50, pp 27586 - 27591
- Pages
- 6
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 7
- Number
- 50
- Start Page
- 27586
- End Page
- 27591
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/64413
- DOI
- 10.1021/acsami.5b08531
- ISSN
- 1944-8244
1944-8252
- Abstract
- All-polymer solar cells exhibit rapid progress in power conversion efficiency (PCE) from 2 to 7.7% over the past few years. While this improvement is primarily attributed to efficient charge transport and balanced mobility between the carriers, not much is known about the charge generation dynamics in these systems. Here we measured exciton relaxation and charge separation dynamics using ultrafast spectroscopy in polymer/polymer blends with different molecular packing and morphology. These measurements indicate that preferential face-on configuration with intermixed nanomotphology increases the charge generation efficiency. In fact, there is a direct quantitative correlation between the free charge population in the ultrafast time scales and the external quantum efficiency, suggesting not only the transport but also charge generation is key for the design of high performance all polymer solar cells.
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Collections - College of Engineering > School of Chemical Engineering and Material Science > 1. Journal Articles
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