Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 1, Pages 618-627Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b11063
Keywords
ternary organic solar cells; PAS; FRET; photophysical process; morphology
Funding
- National Natural Science Foundation of China [11574181, 51372141]
- Research Fund for the Doctoral Program of Higher Education [20130131110004]
- Open Research Fund of State Key Laboratory Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Fundamental Research Funds of Shandong University
- National Young 1000 Talents Program of China
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In dual-donor ternary organic solar cells, the compatibility between the donor polymers plays important roles to control the conformational change and govern the photophysical behavior in the blend films. Here, we apply a post-additive soaking (PAS) approach to reconstruct the morphology in a ternary organic photovoltaic BHJ of PTB7-Th: PCDTBT: PC71BM. The PAS treated device has a maximum power conversion efficiency (PCE) of about 8.7% in this ternary system. From the analyses of GIWAXS and GISAXS, the superior device performance is attributed to the favorable nanomorphology with optimum crystallinity PTI37-Th and good intermixing of PCDTBT with PTB7Th:PC71BM, leading to improved charge transport in the vertical direction. AFM and TRPL measurements clearly demonstrate PAS-treated film envisages a homogeneous distribution of smaller PC71BM aggregates to facilitate the exciton dissociation and carrier extraction at the interface. The increased PCE ascribed to not only the enhancement of absorption and nonradiative Forster resonance energy transfer (FRET) between two donors (PCDTBT and PTB7-Th) but also the formation of a bicontinuous interpenetrating network of PC71BM.
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