Zuo Lijian, Shi Xueliang, Fu Weifei, Jen Alex K-Y
Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195, USA.
Department of Chemistry, University of Washington, Seattle, WA, 98195, USA.
Adv Mater. 2019 Sep;31(36):e1901683. doi: 10.1002/adma.201901683. Epub 2019 Jul 25.
Semitransparent (ST) photovoltaics (PVs) with selective absorption in the UV or/and near-infrared (NIR) range(s) and reduced energy losses, are critical for high-efficiency solar-window applications. Here, a high-performance tandem ST-PV with selected absorption in the desirable regions of the solar spectrum is demonstrated. An ultralarge-bandgap perovskite film (FAPbBr Cl , E ≈ 2.36 eV) is first developed to fulfil efficient selective absorption in the UV region. After optimization, the corresponding ST single junction (SJ) PV exhibits an averaged transmittance (AVT) of ≈68% and an efficiency of ≈7.5%. By sequentially reducing the visible absorbing component in a low-bandgap organic bulk-heterojunction layer, an ST-PV with selective absorption in the NIR is achieved with a power conversion efficiency (PCE) of 5.9% and a high AVT of 62%. The energy loss associated with the SJ ST-PVs is further reduced with a tandem architecture, which affords a high PCE of 10.7%, an AVT of 52.91%, and a light utilization efficiency up to 5.66%. These results represent the best balance of AVT and PCE among all ST-PVs reported so far, and this design should pave the road for solar windows of high performance.
在紫外或/和近红外（NIR）范围内具有选择性吸收且能量损失降低的半透明（ST）光伏（PV）对于高效太阳能窗户应用至关重要。在此，展示了一种在太阳光谱的理想区域具有选择性吸收的高性能串联ST-PV。首先开发了一种超宽带隙钙钛矿薄膜（FAPbBrCl，E≈2.36 eV），以实现紫外区域的高效选择性吸收。经过优化，相应的ST单结（SJ）PV表现出约68%的平均透过率（AVT）和约7.5%的效率。通过依次降低低带隙有机本体异质结层中的可见光吸收成分，实现了在近红外区域具有选择性吸收的ST-PV，其功率转换效率（PCE）为5.9%，高AVT为62%。串联结构进一步降低了与SJ ST-PV相关的能量损失，其提供了10.7%的高PCE、52.91%的AVT和高达5.66%的光利用效率。这些结果代表了迄今为止报道的所有ST-PV中AVT和PCE的最佳平衡，这种设计应为高性能太阳能窗户铺平道路。
