Hybrid Germanium Iodide Perovskite Semiconductors: Active Lone Pairs, Structural Distortions, Direct and Indirect Energy Gaps, and Strong Nonlinear Optical Properties

• DOI: 10.1021/jacs.5b01025
• Publication Date: 2015-05-07T17:54:39Z
• Authors: Constantinos C. S...; Laszlo Frazer; Daniel J. Clark; Yong Soo Kim; Sonny H. Rhim; Arthur J. Freeman; John B. Ketterson; Joon I. Jang; Mercouri G. Kanat...
• Keywords: 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 0104 chemical sciences

AbstractAGeI3 (A: Cs+ (I), MeNH3+ (II), HC(NH2)2+ (III), CH3C(NH2)2+ (IV), C(NH2)3+ (V), Me3NH+ (VI), iPrNH3+ (VII)) polar hybrid inorganic/organic semiconductors are prepared from a solution of GeI4 in aqueous HI and H3PO2 by precipitation and crystallization through the addition of stoichiometric amounts of AI (stirring at 120 °C until half of the solution is evaporated, 25 °C, 24 h, 80‐90% yield).