Spiro-OMeTAD need be completely oxided in atmospheric environment under about 30% humidity as a hole transport layer. But for CsPbI2Br and CsPbI3, moisture can lead to a phase phase transition into non-perovskite phase. Is there anly way to completely oxided the Spiro-OMeTAD for CsPbI2Br and CsPbI3 solar cell without mositure?