2021 Adv. Mater. (If 30.849): Highest Efficiency 21.73%, Flexible Solar Cells with Real-time Monitoring

　　Advanced Materials (IF 30.849) published a study in October 2021. Researchers achieved high and excellent power conversion efficiency (PCE) by integrating low-bandgap organic bulk-heterojunction (BHJ) layers into inverted perovskite (PSC), and successfully used them as power supply for wearable sensors.

　　Due to characteristics such as solubility and low-temperature processability, lead halide perovskites and organic solar cells (PSCs and OSCs) are currently the main materials for clean energy. However, in order to be used in high-performance solar cells, scientists still need to solve the problems of a large number of photon losses and photovoltaic defects in the near infrared (NIR) region.

　　In order to improve these problems, the researchers integrated the low-bandgap organic heterojunction layer into the inverted perovskite and constructed simple hybrid solar cells (HSCs). With solar simulator and quantum efficiency measurement system of Enlitech, the research results showed that the optimized BHJ module had an excellent power conversion efficiency (PCE) of 23.80%. Compared with single-component PSCs and OSCs, hybrid solar cell (HSCs) devices also exhibit excellent long-term (over 1000 hours) light stability. In addition to the EQE (External Quantum Efficiency) spectrum analysis of solar cells, the Quantum Efficiency Measurement System of Enlitech also provides Jsc (short-circuit current density) comparison for the short-circuit current of solar cells under the solar simulator to prove the authenticity of the experiment. Enlitech’s solar simulator and KA-6000 software also provide monitoring of the short-circuit current over time to prove the stability of the solar cell!

　　More importantly, the flexible HSC achieved a PCE of 21.73% and excellent durability. The result of this study is also the highest efficiency of flexible solar cells to date. Furthermore, the researchers successfully integrated the flexible HSC into the power supply of the wearable sensor to demonstrate real-time temperature monitoring.