Abstract
An unprecedentedly stable CH3NH3PbI3 film synthesized by a modified chemical vapor transport method is demonstrated. The results show that the crystal structure, light absorption, and device efficiency do not degrade after storing for 100 d in air with 40% relative humidity, while the conventional solution-processed perovskites are usually stable for less than 20 d in similar conditions.
Highlights
Methylammonium lead iodide (CH3NH3PbI3) based perovskite materials have drawn intense interests due to the excellent photovoltaic energy conversion capability; the power conversion efficiency (PCE) of perovskite solar cell has been boosted to 20.1%.[1]
Han's group employed a thick layer of carbon materials as both hole transporting materials (HTMs) and protection layer to improve the moisture stability; the final PCE reached 12.3% and maintained for over 40 d.[7]
We demonstrate that the intrinsic stability of CH3NH3PbI3 film can be dramatically improved by tailoring the compositional purity and morphology of the perovskite film through a modified chemical vapor transport reaction approach (Figure 1a)
Summary
Methylammonium lead iodide (CH3NH3PbI3) based perovskite materials have drawn intense interests due to the excellent photovoltaic energy conversion capability; the power conversion efficiency (PCE) of perovskite solar cell has been boosted to 20.1%.[1]. We demonstrate that the intrinsic stability of CH3NH3PbI3 film can be dramatically improved by tailoring the compositional purity and morphology of the perovskite film through a modified chemical vapor transport (mCVT) reaction approach (Figure 1a).
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