Li Yanyan, Li Ruiming, Lin Qianqian
Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
Suzhou Institute of Wuhan University, Suzhou, 255123, P. R. China.
Small. 2022 Jul;18(26):e2202028. doi: 10.1002/smll.202202028. Epub 2022 May 26.
Indoor photovoltaics have attracted increasing attention, since they can provide sustainable energy through the recycling of photon energy from household dim lighting. However, solar cells exhibiting high performance under sunlight may not perform well under indoor light conditions, mainly due to the mismatch of the irradiance spectrum. In particular, most of the indoor light sources emit visible photons with negligible near-infrared irradiance. According to the detailed balance theory, the optimal bandgap for indoor photovoltaics should be relatively larger, considering the trade-off between photocurrent and photovoltage losses. In this work, a systematic comparison of the theoretical limits of the conventional and indoor photovoltaics is presented. Then the non-radiative recombination losses are reduced by a synergetic treatment with Pb(SCN) and PEABr, resulting relatively high open circuit voltage of 1.29 V and power conversion efficiency of 17.32% under 1 sun illumination. Furthermore, the devices are fully characterized under weak indoor light (1000 lux, 4000 K LED) achieving a high efficiency of 37.18%, which is promising for real applications.
室内光伏技术已引起越来越多的关注，因为它们可以通过回收家庭昏暗照明中的光子能量来提供可持续能源。然而，在阳光下表现出高性能的太阳能电池在室内光照条件下可能表现不佳，主要是由于辐照光谱不匹配。特别是，大多数室内光源发射的可见光子的近红外辐照可忽略不计。根据详细平衡理论，考虑到光电流和光电压损失之间的权衡，室内光伏的最佳带隙应该相对较大。在这项工作中，对传统光伏和室内光伏的理论极限进行了系统比较。然后通过与Pb(SCN)和PEABr的协同处理降低了非辐射复合损失，在1个太阳光照下产生了相对较高的1.29 V开路电压和17.32%的功率转换效率。此外，这些器件在弱室内光（1000勒克斯，4 LED）下进行了全面表征，实现了37.18%的高效率，这对于实际应用很有前景。
