The inferior stability of perovskite solar cells (PSCs) under ultraviolet (UV) irradiation has been a bottleneck for their further commercialization. Herein, we report a simple strategy to enhance the UV stability of PSCs by using an alkaloid 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) doped C₆₀ electron transport layer (ETL). By improving the electron mobility of ETLs to 2 cm² V⁻¹ s⁻¹ and optimizing the conduction band position to 4.2 eV, the DBU-doped C₆₀ (DBU-C₆₀) ETLs enable the rigid and flexible planner n-i-p PSCs to exhibit PCEs of 20% and 16%, respectively. Most importantly, the devices based on the DBU-C₆₀ ETLs retain over 80% of their initial efficiency after storage either under UV irradiation for 336 h or light socking for 1000 h in an ambient environment. These results indicate that the optimized C₆₀ is a promising electron transport material to stabilize the PSCs under UV light illumination without the cost of efficiency loss.

中文翻译：

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掺杂生物碱的C60电子传输层可实现高效且紫外线稳定的柔性钙钛矿型太阳能电池

钙钛矿型太阳能电池（PSC）在紫外线（UV）照射下的稳定性差已成为其进一步商业化的瓶颈。在这里，我们报告了一种简单的策略，通过使用生物碱1,8-二氮杂双环[5.4.0]十一碳-7-烯（DBU）掺杂的C ₆₀电子传输层（ETL）来增强PSC的紫外线稳定性。通过将ETL的电子迁移率提高至2 cm ² V ^-1 s ^-1并将导带位置优化至4.2 eV，掺杂DBU的C ₆₀（DBU-C ₆₀）ETL可使刚性和柔性平整压区PSC展现出PCE分别为20％和16％。最重要的是，基于DBU-C _60的设备在环境光下，ETL在紫外线照射下存储336小时或在光袜中存储1000小时后，仍保持其初始效率的80％以上。这些结果表明，优化的C ₆₀是一种有希望的电子传输材料，可以稳定UV光照下的PSC，而不会损失效率。