Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 4, Pages 2242-2248Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5057807
Keywords
solar cells; mixed halide lead perovskite; morphology-control; preferential-growth; two-step spin coating; perovskite formation process
Funding
- NSFC [51421002, 51372270, 91433205, 11474333, 91233202]
- MOST (973 Project) [2012CB932903, 2012CB932904]
- Knowledge Innovation Program of the Chinese Academy of Sciences
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A morphology-controlled CH3NH3PbI3-xClx film is synthesized via two-step solution deposition by spin-coating a mixture solution of CH3NH3Cl and CH3NH3I onto the TiO2/PbI2 film for the first time. It is revealed that the existence of CH3NH3Cl is supposed to result in a preferential growth along the [110] direction of perovskite, which can improve both the crystallinity and surface coverage of perovskite and reduce the pinholes. Furthermore, the formation process of CH3NH3PbI3-xClx perovskite is explored, in which intermediates containing chlorine are suggested to exist. 13.12% of power conversion efficiency has been achieved for the mesoscopic cell, higher than 12.08% of power conversion efficiency of the devices fabricated without CH3NH3Cl via the same process. The improvement mainly lies in the increasing open-circuit photovoltage which is ascribed to the reduction of reverse saturation current density.
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