Recent advancements in indoor photovoltaics (IPVs) have put a spotlight on a promising material known as antimony sulfide (Sb2S3). This material, with a bandgap of approximately 1.75 eV, is particularly well-suited for harnessing energy in indoor environments, making it ideal for powering Internet of Things (IoT) devices. Researchers led by Xiao Chen from the School of Electrical Engineering and Automation, Hefei University of Technology, have made significant strides in enhancing the efficiency of Sb2S3 solar cells through a technique called additive engineering.
The challenge with Sb2S3 has been its tendency for nonradiative recombination, a process that limits the performance of solar cells. However, by incorporating monoethanolamine (MEA) into the precursor solution, the team has been able to control the growth of Sb2S3 films. This method results in higher-quality absorbers that feature reduced grain boundary density and optimized band positions. The outcome? A remarkable power conversion efficiency (PCE) of 17.55% under typical indoor lighting conditions, which is a record for Sb2S3 IPVs.
Xiao Chen noted, “The addition of MEA allows for better nucleation and growth of the films, which ultimately leads to improved charge-carrier transport.” This means that the solar cells not only convert light into energy more effectively but also minimize energy losses, a critical factor for any technology aiming for commercial viability.
The implications of this research extend beyond just numbers. With the increasing demand for sustainable energy solutions, particularly in the realm of IoT, the ability to efficiently harvest energy indoors can transform how devices are powered. The team has successfully developed large-area Sb2S3 IPV minimodules capable of powering IoT wireless sensors, showcasing practical applications of their work. These devices can continuously record environmental parameters, demonstrating the potential for long-term, sustainable energy solutions in everyday settings.
As industries look for greener alternatives, this breakthrough presents a significant opportunity for the energy sector. The advancements in Sb2S3 technology could lead to a new wave of indoor energy harvesting systems, paving the way for smarter, more energy-efficient buildings and devices. Published in “Light: Science & Applications,” this research not only underscores the potential of Sb2S3 but also highlights the importance of innovative engineering approaches in the quest for sustainable energy solutions.
