Enhancement of Polymer Bulkheterojunction Solar Cells using Customized Energy Donor Materials

Tae-Hyuk Kwon^a

^aUlsan National Institute of Science and Technology, NSB601-7, Unist-Gil 50, Ulju-Gun, Ulsan, 689, Korea, Republic of

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Tae-Hyuk Kwon, 021
Publication date: 5th February 2015

Energy transfer has been widely exploited in organic light-emitting diodes to enhance emission efficiency and control the color of emission, and in biosensor to increase signal-to-noise ratio. For efficient charge generation in organic solar cells, energy transfer has been emerged as an promising strategy because it can easily broaden a spectral response. For an efficient energy transfer, the energy donor materials are satisfied the following criteria; 1) high quantum efficiency, 2) efficient overlap between the absorption spectrum of the energy acceptor and the emission spectrum of energy donor, 3) minima overlap with the absorption range of energy acceptor, 4) large stroke shift, and 5) a higher energy gap than that of the energy acceptor.Here, we designed new energy donor materials based on iridium complexes considering above the criteria as an energy donor for the representative polymer materials (P3HT and PTB7) as an energy acceptor. The polymer bulk heterojuction solar cells comprised of an iridium complexes as an energy donor (1~10 wt%), polymer materials (P3HT or PTB7) as an energy acceptor, and PCBM.¹ With the energy donor materials designed for P3HT, we demonstrate 20% increase of current density from 8.57 mA/cm² to 10.4 mA/cm², which corresponds to 3.3 % of photo-conversion-efficiency (PCE). Next, customized energy donor materials for PTB7 with PC70BM also show the dramatically enhanced the current density from 14.0 mA/cm² to 16.1 mA/cm² , which corresponds to 8.7% of PCE. Both the observed enhancement of current density comes primarily from the triplet-singlet energy transfer from the customized energy donors to energy acceptors. Transient photoluminance studies reveal triplet-singlet energy transfer from the iridium complexes to energy acceptor (P3HT or PTB7) of over 99%. Because of these high energy transfer efficiency, an enhancement is observed in the incident photon-to-conversion efficiency spectrum between 350 - 550 nm, which overlaps with the absorption range of the iridium complexes.
Figure 1. Schematic diagram of energy transfer from customized energy donor materials to energy acceptor
Yun, M. H.; Lee, E.; Lee, W.; Choi, H.; Lee, B. R.; Song, M. H.; Hong, J.-I.; Kwon, T.-H.; Kim, J. Y. Enhanced performance of polymer bulkheterojunction solar cells employing multifunctional iridium complexes. J. Mat. Chem. C. 2014, 2, 10195

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