Charge transfer state energy in ternary bulk-heterojunction polymer–fullerene solar cells

Sandra Kouijzer; Weiwei Li; Martijn M. Wienk; René A. J. Janssen

doi:10.1117/1.JPE.5.057203

10 December 2014 Charge transfer state energy in ternary bulk-heterojunction polymer–fullerene solar cells

Sandra Kouijzer, Weiwei Li, Martijn M. Wienk, René A. J. Janssen

Author Affiliations +

Journal of Photonics for Energy, Vol. 5, Issue 1, 057203 (December 2014). https://doi.org/10.1117/1.JPE.5.057203

Abstract

In ternary bulk heterojunction solar cells based on a semiconducting biphenyl-dithienyldiketopyrrolopyrrole copolymer donor and two different fullerene acceptors that distinctly differ in electron affinity, the open-circuit voltage is found to depend in a slightly sublinear fashion on the relative ratio of the two fullerenes in the blend. Similar effects have previously been observed and have been attributed to the formation of an alloyed fullerene phase possessing electronic levels that are the weighted average of the two components. By analyzing the contribution of the charge transfer (CT)-state absorption to the external quantum efficiency of the ternary blend solar cells as a function of composition, we find no evidence for a CT state formed between the polymer and an alloyed fullerene phase. Rather, the results are consistent with the presence of two distinct CT states, one for each polymer–fullerene combination. The two-state CT model does not, however, explain the sublinear behavior of the open-circuit voltage as a function of the blend composition.

Citation Download Citation

Sandra Kouijzer, Weiwei Li, Martijn M. Wienk, and René A. J. Janssen "Charge transfer state energy in ternary bulk-heterojunction polymer–fullerene solar cells," Journal of Photonics for Energy 5(1), 057203 (10 December 2014). https://doi.org/10.1117/1.JPE.5.057203

Published: 10 December 2014

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