School of Chemical Engineering and Technology, Tianjin University, 135 Yaguan Road, Tianjin 300350, China.
CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, 2 North First Street, Zhongguancun, Beijing 100190, China.
Nanoscale. 2016 Sep 29;8(38):16881-16885. doi: 10.1039/c6nr05917a.
Tuning the band alignment is proved to be an effective way to facilitate carrier transportation and thus enhance the power conversion efficiency (PCE) of solar cells. Doping the compact layer with metal ions or modifying the interfaces among functional layers in perovskite solar cells (PSCs) can appreciably improve the PCE of PSCs. Inspired by the rare earth elemental doping of TiO, which has witnessed the success in photocatalysis and dye-sensitized solar cells, we firstly demonstrated here that La doping in the mesoporous TiO layer of a mesostructured PSC can tune its Fermi level and thus significantly enhance the device PCE. Systematic analysis reveals that doping La into TiO raises the Fermi level of TiO through scavenging oxygen and inducing vacancies, which subsequently increases the open circuit voltage and the fill factor while reducing the series resistance of the PSC using La-doped TiO as a mesoporous layer. As a result, a PCE of 15.42% is achieved, which is appreciably higher than the PCE of a device with undoped TiO (12.11%).
调整能带排列被证明是一种有效的方法，可以促进载流子输运，从而提高太阳能电池的功率转换效率（PCE）。在钙钛矿太阳能电池（PSCs）中，通过金属离子掺杂致密层或修饰功能层之间的界面，可以显著提高 PSCs 的 PCE。受 TiO 中稀土元素掺杂在光催化和染料敏化太阳能电池中取得成功的启发，我们首次证明，在介孔钙钛矿太阳能电池的介孔 TiO 层中掺杂 La 可以调整其费米能级，从而显著提高器件的 PCE。系统分析表明，通过捕获氧和诱导空位，La 掺杂 TiO 可以提高 TiO 的费米能级，从而提高开路电压和填充因子，同时降低使用 La 掺杂 TiO 作为介孔层的太阳能电池的串联电阻。结果，实现了 15.42%的 PCE，明显高于未掺杂 TiO 的器件的 PCE（12.11%）。
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