Tailoring tandem organics Tandem solar cells can boost efficiency by using a wider range of the solar spectrum. The bandgap of organic semiconductors can be tuned over a wide range, but, for a two-terminal device that directly connects the cells, the currents produced must be nearly equal. Meng et al. used a semiempirical analysis to choose well-matched top- and bottom-cell active layers. They used solution processing to fabricate an inverted tandem device that has a power conversion efficiency as high as 17.4%. Science, this issue p. 1094 A semi-empirical analysis helped to optimize materials for a tandem organic solar cell with high power conversion efficiency. Although organic photovoltaic (OPV) cells have many advantages, their performance still lags far behind that of other photovoltaic platforms. A fundamental reason for their low performance is the low charge mobility of organic materials, leading to a limit on the active-layer thickness and efficient light absorption. In this work, guided by a semi-empirical model analysis and using the tandem cell strategy to overcome such issues, and taking advantage of the high diversity and easily tunable band structure of organic materials, a record and certified 17.29% power conversion efficiency for a two-terminal monolithic solution-processed tandem OPV is achieved.

中文翻译：

---

有机和溶液处理串联太阳能电池，效率为 17.3%

定制串联有机物串联太阳能电池可以通过使用更广泛的太阳光谱来提高效率。有机半导体的带隙可以在很宽的范围内调节，但是，对于直接连接电池的两端器件，产生的电流必须几乎相等。孟等人。使用半经验分析来选择匹配良好的顶部和底部电池活性层。他们使用溶液加工制造了功率转换效率高达 17.4% 的反向串联器件。科学，这个问题 p。1094 半经验分析有助于优化具有高功率转换效率的串联有机太阳能电池的材料。尽管有机光伏（OPV）电池具有诸多优势，但其性能仍远远落后于其他光伏平台。其性能低下的一个根本原因是有机材料的低电荷迁移率，导致活性层厚度和有效光吸收受到限制。在这项工作中，在半经验模型分析的指导下，使用串联电池策略来克服这些问题，并利用有机材料的高度多样性和易于可调的能带结构，创纪录和认证的 17.29% 功率转换效率为实现了两端单片溶液处理串联OPV。