Transporter layers for greater stability Although perovskite solar cells (PSCs) can have power conversion efficiencies exceeding 20%, they can have limited stability under ultraviolet irradiation. This is in part because the mesoporous TiO2 used as an electron-transporting layer can photocatalyze unwanted reactions in the perovskite layer. Shin et al. report a low-temperature colloidal method for depositing La-doped BaSnO3 films as a replacement for TiO2 to reduce such ultraviolet-induced damage. Solar cells retained over 90% of their initial performance after 1000 hours of full sun illumination. Science, this issue p. 167 Ultraviolet damage in perovskite photovoltaics induced by TiO2 in the electron-transporting layer can be avoided with La-doped BaSnO3. Perovskite solar cells (PSCs) exceeding a power conversion efficiency (PCE) of 20% have mainly been demonstrated by using mesoporous titanium dioxide (mp-TiO2) as an electron-transporting layer. However, TiO2 can reduce the stability of PSCs under illumination (including ultraviolet light). Lanthanum (La)–doped BaSnO3 (LBSO) perovskite would be an ideal replacement given its electron mobility and electronic structure, but LBSO cannot be synthesized as well-dispersible fine particles or crystallized below 500°C. We report a superoxide colloidal solution route for preparing a LBSO electrode under very mild conditions (below 300°C). The PSCs fabricated with LBSO and methylammonium lead iodide (MAPbI3) show a steady-state power conversion efficiency of 21.2%, versus 19.7% for a mp-TiO2 device. The LBSO-based PSCs could retain 93% of their initial performance after 1000 hours of full-Sun illumination.

中文翻译：

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胶体制备的 La 掺杂 BaSnO 3 电极用于高效、光稳定的钙钛矿太阳能电池

传输层提高稳定性 虽然钙钛矿太阳能电池 (PSC) 的功率转换效率可以超过 20%，但它们在紫外线照射下的稳定性有限。这部分是因为用作电子传输层的介孔 TiO2 可以光催化钙钛矿层中不需要的反应。申等人。报道了一种低温胶体方法，用于沉积 La 掺杂的 BaSnO3 薄膜，作为 TiO2 的替代品，以减少这种紫外线引起的损伤。太阳能电池在完全阳光照射 1000 小时后仍保持其初始性能的 90% 以上。科学，这个问题 p。167 掺杂 La 的 BaSnO3 可以避免电子传输层中由 TiO2 引起的钙钛矿光伏电池的紫外线损伤。钙钛矿太阳能电池 (PSC) 的功率转换效率 (PCE) 超过 20%，主要是通过使用介孔二氧化钛 (mp-TiO2) 作为电子传输层来证明的。然而，TiO2 会降低 PSCs 在光照（包括紫外光）下的稳定性。鉴于其电子迁移率和电子结构，镧 (La) 掺杂的 BaSnO3 (LBSO) 钙钛矿将是理想的替代品，但 LBSO 不能合成为分散良好的细颗粒或在 500°C 以下结晶。我们报告了一种在非常温和的条件下（低于 300°C）制备 LBSO 电极的超氧化物胶体溶液途径。用 LBSO 和甲基碘化铅 (MAPbI3) 制造的 PSC 显示出 21.2% 的稳态功率转换效率，而 mp-TiO2 器件为 19.7%。