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Abstract title Efficient Perovskite Solar Cells over a Broad Temperature Window: the Role of the Charge Carrier Extraction
Author Dr. Shao, Shuyan Shao, University of groningen, Groningen, Nederland (Presenting Author)
Co-author(s) Liu, J
Fang, H.-H.
Qiu, L
Brink, G
Kooi, B. J.
Hummelen, J. C.
Koster, J. A.
Loi, M. A.
Abstract text

We systematically investigated the mechanism behind the temperature dependence of the device performance in p-i-n hybrid perovskite solar cells (HPSCs). The power conversion efficiency (PCE) of the reference cell using PC60BM as electron extraction layer (EEL) drops significantly, from 11.9% at 295 K to 7% at 180 K. By investigating the temperature, light intensity and morphology dependence of the device performance, we find that the bimolecular recombination process is the dominant loss mechanism causing this degradation. Importantly, temperature dependent spectroscopy and charge transport studies demonstrate that the bimolecular recombination seems to be mainly caused by the poor electron transport properties of the PC60BM EEL at low temperature. We further demonstrate that the n-type doping of PC60BM EEL by poly [(9,9-bis(3′ -(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9–dioctylfluorene)] (PFN) or the use of an EEL (fulleropyrrolidine with a triethylene glycol monoethyl ether side chain, PTEG-1) with higher electron transport capability give rise HPSCs working efficiently over a broad temperature range. Devices fabricated with these highly performing EELs have at 180 K PCEs of 16.7% and 18.2%, respectively. These results support the idea that the temperature dependence of the device performance in HPSCs is limited by the electron transport in the EELs and give directions towards further improvement of the PCE of HPSCs also at room temperature.