Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, China.
Nanoscale. 2017 Jun 22;9(24):8274-8280. doi: 10.1039/c7nr01186e.
The poor air and thermal stability of organic-inorganic halide perovskite solar cells have hindered their real applications. Here we report the insertion of a chemical vapor deposited graphene between the Au electrode and spiro-OMeTAD in planar perovskite solar cells to block the diffusion of air and Au into the perovskite layer, where the single layer graphene is transferred into the devices by a simple laminated process. After ageing in 45% humidity air for 96 h or thermal annealing at 80 °C for 12 h, more than 94% PCE of the devices with graphene can be maintained, which is much better than that of devices without graphene (∼57%). The improved stability of devices with the graphene layer is attributed to the reduction of carrier recombination from decomposition of the perovskite layer in air or Au doping into the perovskite layer under annealing treatment. Therefore, graphene is a promising ultra-thin barrier against air and metal diffusion, and has potential applications in photovoltaic devices, integrated circuit chips and light emitting diodes.
有机-无机卤化物钙钛矿太阳能电池的空气稳定性和热稳定性较差，这阻碍了其实际应用。在这里，我们报告了在平面钙钛矿太阳能电池中插入化学气相沉积石墨烯，以阻挡空气和 Au 向钙钛矿层的扩散，其中单层石墨烯通过简单的层压工艺转移到器件中。在 45%湿度空气下老化 96 小时或在 80°C 下热退火 12 小时后，具有石墨烯的器件的 PCE 仍能保持在 94%以上，这明显优于没有石墨烯的器件（约 57%）。具有石墨烯层的器件稳定性提高归因于在空气或 Au 掺杂到退火处理下的钙钛矿层中分解的情况下，载流子复合的减少。因此，石墨烯是一种很有前途的阻挡空气和金属扩散的超薄材料，在光伏器件、集成电路芯片和发光二极管中有潜在的应用。
