Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
The efficiency of organic solar cells has been increased strongly in recent years, mostly by smart choice of new acceptor materials that show strong complimentary absorption with regard to the donor material.
We have used the absorber material combination D18:Y6 and fabricated solar cells with >1cm2 active area. The devices were measured in our lab and encapsulated before being sent over to the calibration lab at Fraunhofer ISE. The certified efficiency we reached is higher than the record value listed in the last version of the Solar Efficiency Tables [1].
To quantify the remaining optimization potential further measurements were carried out. Light beam induced current (LBIC) was used to reveal the homogeneity of current generation over the active area. Further, electro- and photoluminescence (EL & PL) spectroscopy were applied. Due to the HOMO levels of donor and acceptor being very close together [2], hybridization of the charge transfer state (CT state) with the local exciton state of the acceptor occurs [3]. This leads to a strong CT state emission which is advantageous for characterization via PL. Indeed, in contrast to many other absorber materials, here we observed PL and EL emission essentially at the same wavelength. For the PL, our aim was to disentangle the part of the signal that scales with the density of free charge carriers and therefore delivers important information about the operational state of the device.
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