Journal
ADVANCED MATERIALS
Volume 31, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201806921
Keywords
interfacial layers; morphology; organic solar cells; power conversion efficiency; surface free energy
Categories
Funding
- National Key Research and Development Program of China [2017YFA0206600]
- National Natural Science Foundation of China (NSFC) [21773045, 51703041]
- Chinese Academy of Sciences (100 Top Young Scientists Program)
- NSCF [21674006]
- 111 Project [B14009]
- Chinese Academy of Sciences [QYZDB-SSW-SLH033]
Ask authors/readers for more resources
Interface properties are of critical importance for high-performance bulk-heterojunction (BHJ) organic solar cells (OSCs). Here, a universal interface approach to tune the surface free energy (gamma(S)) of hole-transporting layers (HTLs) in a wide range through introducing poly(styrene sulfonic acid) sodium salts or nickel formate dihydrate into poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is reported. Based on the optimal gamma(S) of HTLs and thus improved face-on molecular ordering in BHJs, enhanced fill factor and power conversion efficiencies in both fullerene and nonfullerene OSCs are achieved, which is attributed to the increased charge carrier mobility and sweepout with reduced recombination. It is found that the face-on orientation-preferred BHJs (PBDB-TF:PC71BM, PBDB-T:PC71BM, and PBDB-TF:IT-4F) favor HTLs with higher gamma(S) while the edge-on orientation-preferred BHJs (PDCDT:PC71BM, P3HT:PC71BM and PDCBT:ITIC) are partial to HTLs with lower gamma(S). Based on the surface property-morphology-device performance correlations, a suggestion to select a suitable HTL in terms of gamma(S) for a specific BHJ with favored molecular arrangement is provided. This work enriches the fundamental understandings on the interface characteristics and morphological control toward high-efficiency OSCs based on a wide range of BHJ materials.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available