Xie Haixia, Yin Xingtian, Guo Yuxiao, Liu Dan, Liang Tong, Wang Gangfeng, Que Wenxiu
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Shaanxi Engineering Research Center of Advanced Energy Materials and Devices, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, People's Republic of China.
State Key Laboratory for Strength and Vibration of Mechanical Structures, Department of Engineering Mechanics, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, People's Republic of China.
Nanotechnology. 2021 Mar 5;32(10):105205. doi: 10.1088/1361-6528/abcf70.
Low temperature derived carbon electrodes are employed to fabricate low cost hole transport layer free perovskite solar cells, in which perovskite films annealed in glovebox and ambient air are used as the absorbers, respectively. Results suggest that the air annealed sample has bigger crystal grains and higher crystallinity, and the existence of a small amount of lead iodide which passivates grain boundaries contributes to a lower trap density. As a result, a maximum power conversion efficiency (PCE) of 13.07% was obtained on the air annealed device, which is higher than those of devices annealed in glovebox (11.25%). Furthermore, the stability of unencapsulated devices stored in wet (with humidity around 90% ± 5%) air atmosphere are investigated and the results prove that our devices exhibit good stability. In addition to rigid devices, flexible perovskite solar cells are also fabricated using the same procedure. The highest PCE of 11.53% is demonstrated on the champion flexible device, and 69% of its initial PCE can be maintained even after 2000 bending cycles with a bending radius of 2 mm. Our work provides a promising and simple rout for low-cost, air-stable, high-efficiency carbon perovskite solar cells for both large area production and flexible electronic devices industry.
采用低温衍生碳电极制备低成本无空穴传输层的钙钛矿太阳能电池，其中分别将在手套箱和环境空气中退火的钙钛矿薄膜用作吸收层。结果表明，空气退火样品具有更大的晶粒和更高的结晶度，少量钝化晶界的碘化铅的存在有助于降低陷阱密度。因此，空气退火器件的最大功率转换效率（PCE）达到13.07%，高于在手套箱中退火的器件（11.25%）。此外，还研究了未封装器件在潮湿（湿度约90%±5%）空气气氛中的稳定性，结果证明我们的器件具有良好的稳定性。除了刚性器件外，还采用相同的工艺制备了柔性钙钛矿太阳能电池。在冠军柔性器件上展示了11.53%的最高PCE，即使在弯曲半径为2 mm的情况下经过2000次弯曲循环后，仍能保持其初始PCE的69%。我们的工作为低成本、空气稳定、高效的碳基钙钛矿太阳能电池的大面积生产和柔性电子器件行业提供了一条有前景且简单的途径。
