有机太阳能电池(organic solar cells,OSCs)是光伏发电和能源功能材料的重要组成部分,因其制作简单、材料来源广泛、轻量化、柔性好等突出优势成为电池材料领域研究的热点.然而,与无机/钙钛矿太阳能电池相比,有机太阳能电池存在较大的电压损失(即能量损失),限制了效率的进一步提升.目前实验室报道最高效率远低于肖克利-奎伊瑟(Shockley-Queisser)理论所定义的极限效率.因此,最大化降低有机太阳能电池的电压损失,是进一步提升电池器件效率的关键.针对上述问题,国家纳米科学中心的相关科研人员做出了很多努力,在高开路电压、低能量损失的有机太阳能电池分子设计、理论计算以及新型器件结构等方面做了非常出色的工作.本文综述了近年来的相关研究进展,希望为有机太阳能电池相关领域的研究者提供借鉴并对有机太阳能电池的发展起到促进作用.
Research progress of high open circuit voltages and low energy loss organic solar cells
Organic solar cells(OSCs)are an important component of photovoltaic power generation and energy functional materials.OSCs have become a hot research topic in the field of solar cell materials due to their outstanding advantages such as simple production process,wide material sources,light weight,and good flexibility.However,compared to inorganic/perovskite solar cells,there is a significant voltage loss(energy loss)in organic solar cells,which limits further efficiency improvement.However,in certain specific environments and application scenarios such as aerospace,automotive,and building integration,OSCs can be considered as a necessary supplement to inorganic solar cells and perovskite solar cells due to their unique advantages.The research on organic solar cells has developed rapidly in the past decade and has made tremendous progress.The power conversion efficiency(PCE)of small area devices has exceeded 19％,but is still difficult to exceed 20％.At present,the highest efficiency reported in the laboratory is far lower than the limit efficiency defined by the Shockley-Queisser theory.Therefore,improving energy conversion efficiency remains the main goal pursued by OSCs at this stage.Therefore,maximizing the reduction of voltage loss in organic solar cells is the key to further improving the efficiency of photovoltaic devices.Statistics show that the voltage loss of most organic systems is around 0.55-1.0 V,and only a few systems have voltage losses below 0.5 V.In addition,voltage loss and energy loss(Eloss)are related,especially non radiative energy loss,which seriously restricts the improvement of open circuit voltages and efficiency of OSCs.In response to the above issues,researchers from the National Center for Nanoscience and Technology(NCNST)have made a lot of efforts.They have done excellent work in molecular design,theoretical calculations,and new device structures of organic solar cells with high open circuit voltages and low energy loss.Especially,Zhou Erjun et al.designed and constructed series of molecules with benzotriazole units;Lu Kun,Zhu Lingyun and Wei Zhixiang et al.regulated molecular arrangement and stacking by improving molecular stacking ability,crystallinity,aggregation structures;and they combined the theory of exciton binding energy to reduce recombination energy and energy disorder,leading to reduced energy loss;Sun Xiangnan et al.have done a lot of excellent work in the construction of organic spin photovoltaic devices.This paper reviews the research progress in recent years,which is hoped to provide some guidances for researchers in the field of organic solar cells and promote the development of organic solar cells.
organic solar cellhigh open circuit voltageenergy lossexciton binding energy
NETL
NSTL
万方数据
维普
