000199895 001__ 199895
000199895 005__ 20181203023533.0
000199895 0247_ $$2doi$$a10.1021/nl500399m
000199895 022__ $$a1530-6984
000199895 02470 $$2ISI$$a000336074800055
000199895 037__ $$aARTICLE
000199895 245__ $$aNanocrystalline Rutile Electron Extraction Layer Enables Low-Temperature Solution Processed Perovskite Photovoltaics with 13.7% Efficiency
000199895 260__ $$bAmerican Chemical Society$$c2014$$aWashington
000199895 269__ $$a2014
000199895 300__ $$a6
000199895 336__ $$aJournal Articles
000199895 520__ $$aWe demonstrate low-temperature (70 degrees C) solution processing of TiO2/CH3NH3PbI3 based solar cells, resulting in impressive power conversion efficiency (PCE) of 13.7%. Along with the high efficiency, a strikingly high open circuit potential (V-OC) of 1110 mV was realized using this low-temperature chemical bath deposition approach. To the best of our knowledge, this is so far the highest V-OC value for solution-processed TiO2/CH3NH3PbI3 solar cells. We deposited a nanocrystalline TiO2 (rutile) hole-blocking layer on a fluorine-doped tin oxide (FTO) conducting glass substrate via hydrolysis of TiCl4 at 70 degrees C, forming the electron selective contact with the photoactive CH3NH3PbI3 film. We find that the nanocrystalline rutile TiO2 achieves a much better performance than a planar TiO2 (anatase) film prepared by high-temperature spin coating of TiCl4, which produces a much lower PCE of 3.7%. We attribute this to the formation of an intimate junction of large interfacial area between the nanocrystalline rutile TiO2 and the CH3NH3PbI3 layer, which is much more effective in extracting photogenerated electrons than the planar anatase film. Since the complete fabrication of the solar cell is carried out below 100 degrees C, this method can be easily extended to plastic substrates.
000199895 6531_ $$aChemical bath deposition
000199895 6531_ $$atitanium dioxide
000199895 6531_ $$asolar cells
000199895 6531_ $$aperovskite absorber
000199895 6531_ $$aCH3NH3PbI3
000199895 6531_ $$alow-temperature fabrication
000199895 700__ $$0244230$$g198812$$aYella, Aswani
000199895 700__ $$0244221$$g196695$$aHeiniger, Leo-Philipp
000199895 700__ $$0245127$$g207176$$aGao, Peng
000199895 700__ $$aNazeeruddin, Mohammad Khaja$$g105958$$0240422
000199895 700__ $$aGraetzel, Michael$$g105292$$0240191
000199895 773__ $$j14$$tNano Letters$$k5$$q2591-2596
000199895 909C0 $$xU10101$$0252060$$pLPI
000199895 909CO $$pSB$$particle$$ooai:infoscience.tind.io:199895
000199895 917Z8 $$x105528
000199895 937__ $$aEPFL-ARTICLE-199895
000199895 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000199895 980__ $$aARTICLE