High‐Efficiency Carbon‐Based CsPbIBr2 Solar Cells with Interfacial Energy Loss Suppressed by a Thin Bulk‐Heterojunction Layer

• DOI: 10.1002/solr.202100375
• Publication Date: 2021-07-20T17:10:41Z
• Authors: Deng Wang; Wenjing Li; Ruoshui Li; Weihai Sun; Jihuai Wu; Zhang Lan
• Keywords: Active layer; Perovskite solar cell

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