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concentration region [100]. Thus, the effect of high concentration of Cl´ on the morphologies and electronic properties of the perovskite can still not be ignored. Additionally, whether Cl´ is predominantly present as a substituent for I´, as an interstitial, or at the surface of the crystal, remains unclear [101] and this is worth further investigation. Conflictsof Interest: Conflictsof Interest: Theauthorsdeclarenoconflictof interest. References 1. Kojima, A.; Teshima, K.; Shirai, Y.; Miyasaka, T. Organometal halide perovskites as visible-lightsensitizers forphotovoltaiccells. J.Am.ChemSoc. 2009,131, 6050–6051. 2. Yang,W.S.;Noh, J.H.; Jeon,N.J.;Kim,Y.C.;Ryu,S.;Seo, J.; Seok,S.I.High-performance photovoltaic perovskite layers fabricated through intramolecular exchange.Science2015, 348, 1234–1237. 3. Kim, H.S.; Im, S.H.; Park, N.G. Organolead halide perovskite: New horizons in solar cell research. J.Phys. Chem.C2014,118, 5615–5625. 4. Luo, S.; Daoud, W.A. Recent progress in organic-inorganichalide perovskite solar cells: Mechanismsandmaterialsdesign. J.Mater. Chem.A2015,3, 8992–9010. 5. Mohammad,K.N.;Gao,P.;Gratzel,M.Organohalide leadperovskites forphotovoltaic applications.Energ. Environ. Sci.2014,7, 2448–2463. 6. Dualeh, A.; Tétreault, N.; Moehl, T.; Gao, P.; Nazeeruddin, M.K.; Grätzel, M. Effect ofannealingtemperatureonfilmmorphologyoforganic-inorganichybridpervoskite solid-statesolarcells.Adv. Funct.Mater. 2014,24, 3250–3258. 7. Stranks, S.D.; Eperon, G.E.; Grancini, G.; Menelaou, C.; Alcocer, M.J.P.; Leijtens, T.; Herz, L.M.; Petrozza, A.; Snaith, H.J. Electron-hole diffusion lengths exceeding 1 micrometer in an organometal trihalide perovskite absorber.Science2013,342, 341–344. 8. Colella, S.; Mosconi, E.; Fedeli, P.; Listorti, A.; Gazza, F.; Orlandi, F.; Ferro, P.; Besagni, T.; Rizzo, A.; Calestani, G.; et al. MAPbI3-xClx mixed halide perovskite for hybrid solar cells: The role of chloride as dopant on the transport and structural properties.ChemMater. 2013,25, 4613–4618. 9. Conings, B.; Baeten, L.; de Dobbelaere, C.; D’Haen, J.; Manca, J.; Boyen, H.-G. Perovskite-basedhybridsolarcellsexceeding10%efficiencywithhighreproducibility usingathinfilmsandwichapproach.Adv.Mater. 2014,26, 2041–2046. 10. Zhao, Y.; Zhu, K. CH3NH3Cl-assisted one-step solution growth of CH3NH3PbI3: Structure, charge-carrier dynamics, and photovoltaic properties of perovskite solar cells. J.Phys. Chem.C2014,118, 9412–9418. 11. Colella, S.; Mosconi, E.; Pellegrino, G.; Alberti, A.; Guerra, V.L.P.; Masi, S.; Listorti, A.; Rizzo,A.;Condorelli,G.G.;DeAngelis,F.; et al. Elusivepresenceofchloride inmixed halideperovskitesolarcells. J.Phys. Chem. Lett. 2014,5, 3532–3538. 106