Macromolecular Chemistry I, University of Bayreuth, Universitätstr. 30, 95447, Bayreuth, Germany.
Experimental Physics II, University of Bayreuth, Universitätstr. 30, 95447, Bayreuth, Germany.
Adv Mater. 2016 Mar 23;28(12):2446-54. doi: 10.1002/adma.201503832. Epub 2016 Jan 29.
The migration and accumulation of iodide ions create a modulation of the respective interfacial barriers causing the hysteresis in solar cells based on methylammonium lead iodide perovskites. Iodide ions are identified as the migrating species by measuring temperature dependent current-transients and photoelectron spectroscopy. The involved changes in the built-in potential due to ion migration are directly measured by electroabsorption spectroscopy.
碘离子的迁移和积累会调制相应的界面势垒，导致基于甲脒碘化铅钙钛矿的太阳能电池出现滞后现象。通过测量温度相关的电流瞬变和光电子能谱，确定碘离子是迁移的物种。由于离子迁移引起的内置电势变化可以通过电吸收光谱直接测量。
