The CsPbIBr₂ perovskite has obvious advantages in balancing the stability and efficiency in inorganic perovskite solar cells (PSCs). Its large bandgap of 2.08 eV, which leads to a narrow spectral absorption (<600 nm), is the key limit to yielding a high power conversion efficiency (PCE). Herein, it is demonstrated that by integrating a thin bulk-heterojunction (BHJ) layer (19 nm) composed of the typical poly (3-hexylthiophene-2,5-diyl) and [6,6]-phenyl methyl C61 butyric acid methyl ester (P3HT:PCBM) with CsPbIBr₂ perovskite, a carbon-based all-inorganic PSC achieves a much higher champion PCE (11.54%) than the original CsPbIBr₂ device (8.87%), and the value is also at the highest PCE level of all-inorganic CsPbIBr₂ PSCs. The integration of a thin BHJ layer brings an expanded light absorption range, better charge transfer dynamics, suppressed interfacial energy loss, and improved long-term stability. The unencapsulated CsPbIBr₂ PSC with an integrated BHJ layer shows excellent long-term stability in an ambient atmosphere with high relative humidity (RH ≈ 45%, T ≈ 25 °C). Therefore, the BHJ integration is an effective strategy on the road to industrialization of carbon-based all-inorganic PSCs with low cost, high efficiency, and excellent long-term stability.

中文翻译：

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具有由薄体异质结层抑制界面能量损失的高效碳基 CsPbIBr2 太阳能电池

CsPbIBr ₂钙钛矿在平衡无机钙钛矿太阳能电池（PSC）的稳定性和效率方面具有明显优势。其 2.08 eV 的大带隙导致窄光谱吸收 (<600 nm)，是产生高功率转换效率 (PCE) 的关键限制。在此，证明了通过集成由典型的聚 (3-hexylthiophene-2,5-diyl) 和 [6,6]-苯基甲基 C61 丁酸甲基组成的薄体异质结 (BHJ) 层 (19 nm)酯（P3HT：PCBM）与CsPbIBr ₂钙钛矿，一种碳基全无机PSC实现了比原始CsPbIBr ₂器件（8.87％）高得多的冠军PCE（11.54 ％），并且该值也处于最高PCE水平全无机 CsPbIBr ₂PSC。薄 BHJ 层的集成带来了扩大的光吸收范围、更好的电荷转移动力学、抑制界面能量损失和提高的长期稳定性。具有集成 BHJ 层的未封装 CsPbIBr ₂ PSC 在具有高相对湿度（RH ≈ 45%，T  ≈ 25 °C）的环境大气中显示出出色的长期稳定性。因此，BHJ集成是低成本、高效率、长期稳定性优异的碳基全无机PSC产业化道路上的有效策略。