Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 61: Posters III (Organic-inorganic perovskite semiconductors; Organic photovoltaics and electronics; Photovoltaics; Energy science; New materials and concepts)
HL 61.13: Poster
Mittwoch, 18. März 2015, 15:00–20:00, Poster F
Electroabsorption spectroscopy investigation of organic and perovskite solar cells — •Cheng Li1,3, Yana Vaynzof2,3, Tanaji Gujar1, Dan Credgington3, Zhi-Kuang Tan3, Girish Lakhwani3, Jianpu Wang3,4, Mukundan Thelakkat1, Neil Greenham3, and Sven Hüttner1,3 — 1Macromolecular Chemistry I, University of Bayreuth, 95440 Bayreuth, Germany — 2Centre for Advanced Materials, Im Neuenheimer Feld 227, Heidelberg University, Heidelberg, 69120, Germany — 3Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom — 4Institute of Advanced Materials, Nanjing Tech University, Nanjing, China 210009
In solution-processed photovoltaic devices, both organic and organic-inorganic perovskite based, the nanometer scale interfaces between the active material and electrodes play a crucial role on the device performance. In this poster, by using electroabsoption (EA) spectroscopy, combined with ultraviolet photoelectron spectroscopy (UPS), we investigate photovoltaic devices based on P3HT:PCBM, PBDTTT-CT:PC71BM and CH3NH3PbI3−xClx systems. As a non-invasive method, EA provides unique information of the built-in potential (VBI) in working devices. By characterizing the modulation of VBI, we elucidate that the performance improvement of these solar cells utilizing interfacial engineering is mainly due to the shift of work function of electrodes, leading to an increase of the built-in potential in devices.