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Proceedings Paper

Exploring the limits of hybrid TiO2/conjugated polymer photovoltaic cells
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Paper Abstract

In hybrid polymer photovoltaics, conjugated polymers are combined with wide bandgap metal oxide semiconductors like TiO2 or ZnO. Reported maximum power conversion efficiencies (PCE) at AM1.5G conditions for a hybrid polymer bulkheterojunction device are up to 1.6 %. In this paper we report on the current-voltage characteristics of bi-layer devices consisting of TiO2 and a conjugated polymer. Several polymers with different optical bandgap were studied. The maximum External Quantum Efficiency (EQE) of the devices is comparable, but the PCE differs considerably (0.2-0.5%). The differences can for a large part be explained by the differences in optical bandgap of the polymers. It is shown that a low band gap is beneficial for the short circuit current, but does not automatically result in a high PCE as relative shifts of the highest occupied molecular orbital (HOMO) energy levels of the polymers reduce the open circuit voltage (Voc). The calculations show that a PCE up to ~ 19 % can be achieved using the maximum possible Voc and a fill factor of 80%. Judicious engineering of material combinations is required to achieve such a power output, and it expresses the need for a continuing search on potentially low cost, efficient metal oxide/polymer BHJ structures.

Paper Details

Date Published: 3 October 2005
PDF: 8 pages
Proc. SPIE 5938, Organic Photovoltaics VI, 59380K (3 October 2005); doi: 10.1117/12.614362
Show Author Affiliations
L. H. Slooff, ECN Solar Energy (Netherlands)
Dutch Polymer Institute (Netherlands)
S. C. Veenstra, ECN Solar Energy (Netherlands)
Dutch Polymer Institute (Netherlands)
J. M. Kroon, ECN Solar Energy (Netherlands)
Dutch Polymer Institute (Netherlands)
M. M. Koetse, TNO Science and Industry (Netherlands)
Dutch Polymer Institute (Netherlands)
J. Sweelssen, TNO Science and Industry (Netherlands)
Dutch Polymer Institute (Netherlands)
M. M. Wienk, Eindhoven Univ. of Technology (Netherlands)
Dutch Polymer Institute (Netherlands)

Published in SPIE Proceedings Vol. 5938:
Organic Photovoltaics VI
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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