Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 50, Pages 43871-43879Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b13494
Keywords
inverted nonfullerene polymer solar cells; vertical phase separation; long-term stability; electrode modification layer; titanium (diisopropoxide)-bis-(2,4-pentanedionate)
Funding
- NSFC [51573042]
- Fundamental Research Funds for the Central Universities, China [JB2015RCJ02, 2016YQ06, 2016MS50, 2016XS47]
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For bulk heterojunction polymer solar cells (PSCs), the donors and acceptors featuring specific phase separation and concentration- distribution within the electron donor/acceptor blends crucially affect the exeiton dissociation and charge transportation. Herein, efficient and stable nonfullerene inverted PSCs incorporating a phase separated photoactive layer and a titanium *late electrode modification layer are demonstrated'. Water contact angle (WCA), scanning kelvin probe microscopy (SREM), and atomic force Microscopy (AFM) techniques are implemented to characterize the morphology of photoactive layers. Compared with the control conventional device, the-Short-circuit current density (1) is enhanced from 14.74 to 17.45 mAcm(-2). The power conversion efficiency (PCE) for the inverted PSCs with a titanium (diisopropoxide)-bis(2,4-pentanedfonate) (Thin) layer increases from 9.67% to 11.69% benefiting from the declined exciton recombination and fairly enhanced charge transportation. Furthermore, the nonencapsulatedinverted device with a TIPD layer demonstrates the best long-term stability, 85% of initial PCE remaining and an almost undecayed open-circuit voltage (V-oc) after 1440 h. Our results reveal that the titanium chelate is an excellent electrode modification layer to incorporate with a vertical phase separated photoactive layer for producing high-efficiency and inverted nonfullerene PS Cs.
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