Publication date: 1st July 2014
Organometallic halide perovskite compounds have recently emerged as a new class of excellent light absorbers with good carrier-transport property and thus, have demonstrated exceptional progress in solar cells performance. These compounds exhibit very high efficiency in simple planar configurations. As these perovskite structures are hygroscopic, atmospheric conditions significantly influence the crystallization of these structures and hence, change the cell performance drastically. Here, we report the effect of humid and dry atmospheric conditions on surface coverage and morphology of perovskite (CH3NH3PbI3-xClx) films prepared on FTO/TiO2 compact layer. The performance and stability of these perovskite sensitized solid-state planar solar cells using spiro-OMeTAD as hole transport materials have been studied. Our samples, which are solution processed planar thin-film architectures (FTO/compact TiO2/perovskite/HTM/Au) showed remarkable photovoltaic performance with excellent stability. The cells stored in dry conditions (humidity lower than 1%) without encapsulation exhibited long-term stability. The solar cells fabricated under optimal condition achieved a PCE of 17.3%, which we believe to be the highest value reported to date for a simple planar heterojunction structure. Moreover, the content of the Cl in a final perovskite film have also been discussed.
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