PMSE Alshakim Nelson, Matthew Becker, Sergio Granados-Focil, Christopher Stafford  Tuesday, March 18, 2014 

182 - Interfacial engineering for high performance inverted polymer solar cells

Xiong Gong, xgong@uakron.edu, Department of Polymer Engineering, The University of Akron, Akron, OH 44235, United States

Interfacial Engineering for High Performance Inverted Polymer Solar Cells

Xiong Gong,1 Chao Yi,1 Xiaowen Hu,1,2 He Ren,1 Lin Huang,3 Xiaocun Lu,1 Fei Huang,2 Yong Cao2

George R. Newkome,1 and Stephen Z. D. Cheng1

1 College of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH 44325, USA

2 State Key Laboratory of Luminescent Materials and Devices, South China University and Technology, Guangzhou, P. R. China

3 Brucker Nano Surface Division, 112 Robin Hill Road, Santa Barbara, CA 93117, USA



ABSTRACT

Bulk heterojunction (BHJ) polymer solar cells (PSCs) that can be fabricated by solution processing techniques are under intense investigation in both academic and industrial sectors because of their potential to enable mass production of flexible and cost-effective alternative of silicon-based solar cells. A combination of novel polymer development, nanoscale morphology control and processing optimization has led to over 9% of power conversion efficiencies (PCEs) for BHJ PSCs with a conventional device structure. Attempts to develop PSCs with an inverted device structure as required for achieving high PECs and good stability have, however, met with limited success. Here, we report interfacial engineering for high performance inverted polymer solar cells. Our review include: (1) solution-processed zinc oxide (ZnO) thin film as an electron extraction layer for inverted polymer solar cells. Operated at room temperature, no obviously degradation was observed from the PSCs with ZnO layer after continuously illuminating the devices for 4 hours. However, a significantly degradation was observed from the PSCs without ZnO buffer layer after illuminating the devices only for 1 hour. Furthermore, PSCs with ZnO buffer layer also show very good shelf stability; only 10 % degradation observed in PCEs after 6 months; (2) a high PCE of 8.4% under AM1.5G irradiation was achieved for BHJ PSCs with an inverted device structure. This high efficiency was obtained through interfacial engineering of solution-processed electron extraction layer, ZnO, leading to facilitated electron transport and suppressed bimolecular recombination; (3) Further study of the effect on a novel water/alcohol-soluble neutral fullerene derivative (PC60BM-G2 ) layer on the device performance of the inverted PSCs is investigated. An over 30% enhancement in PCE was observed from the inverted PSCs with PC60BM-G2 layer to reengineer the surface of the ZnO EEL, when compared with those without PC60BM-G2 layers. All these results provided an important progress for solution-processed PSCs, and demonstrate that PSCs with an inverted device structure are comparable to PSCs with the conventional device structure.


Tuesday, March 18, 2014 02:25 PM
Conjugated Polymers for Optoelectronics, Electronics and Biosensors (02:00 PM - 06:30 PM)
Location: Hyatt Regency Dallas
Room: Cumberland B

 

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