Ternary organic solar cells with small voltage losses (Conference Presentation)

Yongxi Li; Stephen Forrest

doi:10.1117/12.2320832

18 September 2018 Ternary organic solar cells with small voltage losses (Conference Presentation)

Yongxi Li, Stephen Forrest

Proceedings Volume 10737, Organic, Hybrid, and Perovskite Photovoltaics XIX; 107370M (2018) https://doi.org/10.1117/12.2320832
Event: SPIE Organic Photonics + Electronics, 2018, San Diego, California, United States

Abstract

The voltage loss in organic photovoltaics (OPVs) is defined as the difference between the open circuit voltage and the voltage offset between the lowest unoccupied molecular orbital (LUMO) of the acceptor and the highest occupied MO (HOMO) of the donor forming the charge dissociating heterojunction. Widely employed fullerene acceptors show significant voltage losses, approaching 0.8 V, thereby reducing the potential efficiencies of OPVs. In this work, we show that ternary blends of two non-fullerene acceptors with a polymer donor are effective in significantly reducing the voltage losses in near-infrared (NIR) OPVs. A narrow energy gap non-fullerene acceptor, FIDC, sharing similar HOMO energies with the acceptor BT-CIC [1], (absorption up to 1000 nm) is blended with the polymer PCE-10. The power conversion efficiency (PCE) of the ternary cell is increased from 10.7% in a BT-CIC:PCE-10 binary cell to 12.6% in the BT-CIC:FIDC:PCE-10 ternary cell. Further, the short-circuit current density is increased from 22.3 mA cm-2 to 25.5 mA cm-2. Importantly, the ternary cell decreased the voltage loss from 0.61 to 0.54 V. The ternary devices showed larger open circuit voltage of 0.70V than either the analogous BT-CIC (0.69 V) or FIDC (0.66 V) binary devices [2,3]. This work points to a simple means for increasing the materials available for spanning the visible and NIR spectra in very high efficiency, low loss OPVs. 1. Li, Y.; Lin, J.-D.; Che, X.; Qu, Y.; Liu, F.; Liao, L.-S.; Forrest, S. R. J. Am. Chem. Soc. 2017, 139, 17114. 2. Ameri, T.; Khoram, P.; Min, J.; Brabec, C. J. Adv. Mater. 2013, 25, 4245. 3. Fu, H.; Wang, Z.; Sun, Y. Solar RRL 2018, 2, 1700158.

Conference Presentation

Citation Download Citation

Yongxi Li and Stephen Forrest "Ternary organic solar cells with small voltage losses (Conference Presentation)", Proc. SPIE 10737, Organic, Hybrid, and Perovskite Photovoltaics XIX, 107370M (18 September 2018); https://doi.org/10.1117/12.2320832

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Organic photovoltaics

Solar cells

Binary data

Near infrared

Polymers

Solar energy

Absorption

Show All Keywords

Keywords/Phrases

Search In:

Publication Years