Hybrid lead iodide perovskite materials exhibit a high absorption coefficient up to 1.5 × 104 cm−1 at 550 nm, estimated from a CH3NH3PbI3 coated nanocrystalline TiO2 thin film, which indicates that the penetration depth for 550 nm light is only 0.66 μm
Hybrid lead iodide perovskite materials exhibit a highabsorption coefficient up to 1.5 × 104 cm−1 at 550 nm, estimatedfrom a CH3NH3PbI3 coated nanocrystalline TiO2 thinfilm, which indicates that the penetration depth for 550 nmlight is only 0.66 μm