Organometallic-halide perovskite solar cells (PSCs) are emerging as the most promising next generation solar cell devices. However, the stability is still the main bottleneck of their further development. Here, we introduce two-dimensional (2D) molybdenum chalcogenides (MoS₂ and MoSe₂) (MCs) nanoflakes as a buffer layer between perovskite layer and hole transport layer (HTL) to improve the stability of the organometallic-halide PSCs. 2D MCs are obtained via liquid-phase exfoliated (LPE) approach, and Glass/FTO/compact-TiO₂/ mesoporous-TiO₂/FA₈₅MA₁₅PbI₈₅Br₁₅/2D MCs/Spiro-OMeTAD/Au structured solar cell devices are designed and fabricated. In this system, 2D MCs act both as a protective layer and an additional HTL of PSCs. This kind of PSCs achieve a relatively high-power conversion efficiency (PCE) of 14.9%, along with a much longer lifetime stability compared to the standard PSCs. After 1 h, PCE of the PSC adding a 2D MCs buffer layer could maintain 93.1% of initial value, while the PCE of the standard PSC dropped dramatically to 78.2% of initial efficiency. Our results pave the way towards the implementation of 2D MCs nanoflakes as a material able to boost the shelf life of PSCs and further provide the opportunity to fabricate large-area PSCs in view of their commercialization.

有机金属卤化物钙钛矿太阳能电池（PSC）成为最有前途的下一代太阳能电池设备。但是，稳定性仍然是其进一步发展的主要瓶颈。在这里，我们介绍了二维（2D）硫属钼化物（MoS ₂和MoSe ₂）（MCs）纳米片作为钙钛矿层和空穴传输层（HTL）之间的缓冲层，以提高有机金属卤化物PSC的稳定性。通过液相剥落（LPE）方法以及玻璃/ FTO /复合TiO ₂ /中孔TiO ₂ / FA ₈₅ MA ₁₅ PbI ₈₅ Br ₁₅获得二维MC设计和制造/ 2D MC / Spiro-OMeTAD / Au结构的太阳能电池设备。在此系统中，二维MC既充当保护层，又充当PSC的附加HTL。与标准PSC相比，这种PSC的功率转换效率（PCE）高达14.9％，寿命稳定性更高。1小时后，添加2D MC缓冲层的PSC的PCE可以维持初始值的93.1％，而标准PSC的PCE则急剧下降至初始效率的78.2％。我们的研究结果为实现2D MC纳米薄片铺平了道路，这种薄片能够延长PSC的保存期限，并鉴于其商业化性而为制造大面积PSC提供了机会。