期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 50, 页码 27586-27591出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b08531
关键词
all polymer solar cells; charge generation/recombination; nanomorphology; polymer packing; ultrafast spectroscopy
资金
- Office of Naval Research (ONR) [N000141310526 P00002]
- National Research Foundation - Korean Government [2012M3A6A7055540, 2013R1A2A1A03069803]
- National Research Foundation of Korea [2013R1A2A1A03069803] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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