Co-Evaporated Formamidinium Lead Iodide Based Perovskites with 1000 h Constant Stability for Fully Textured Monolithic Perovskite/Silicon Tandem Solar Cells,Advanced Energy Materials

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Co-Evaporated Formamidinium Lead Iodide Based Perovskites with 1000 h Constant Stability for Fully Textured Monolithic Perovskite/Silicon Tandem Solar Cells
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2021-07-22 , DOI: 10.1002/aenm.202101460
Marcel Roß ₁ , Stefanie Severin ₁ , Marvin Björn Stutz ₂ , Philipp Wagner ₁ , Hans Köbler ₃ , Martin Favin‐Lévêque ₁ , Amran Al‐Ashouri ₁ , Paul Korb ₁ , Philipp Tockhorn ₁ , Antonio Abate ₃ , Bernd Stannowski _{4,

5} , Bernd Rech _{6,

7} , Steve Albrecht _{1,

6}

Affiliation

Formamidinium iodide (FAI) based perovskite absorbers have been shown to be ideal candidates for highly efficient and operationally stable perovskite solar cells (PSC). A major challenge for formamidinium lead iodide (FAPbI₃) is to suppress the phase transition from the photoactive black phase into yellow nonperovskite δ-phase. Several approaches to stabilize the black phase have been developed for solution-based perovskites, whereas so far, vacuum-deposited FAPbI₃ has rarely been reported. This study demonstrates the preparation of FAPbI₃ by co-evaporation and discusses the influence of the subjacent hole transporting layer (HTL) on its phase stability. By using FAI excess in the evaporation process in combination with phosphonic acids groups from the HTL, the black perovskite phase is stabilized at room temperature. Further addition of 32–59% methylammonium iodide (MAI) during the co-evaporation process leads to good absorption properties and high PSC efficiencies of 20.4%. In addition, excellent stability is achieved for optimized MAI to FAI ratios, maintaining 100% of the initial PSC performance after 1000 h under constant operation. This highly stable perovskite composition enables the first monolithic fully textured perovskite/silicon tandem solar cells with co-evaporated perovskite absorbers. Due to the conformally covered pyramid texture, these tandem cells show minimal reflection losses and reach an efficiency of 24.6%.

中文翻译：

共蒸发甲脒基碘化铅钙钛矿，具有 1000 小时恒定稳定性，用于全纹理单片钙钛矿/硅串联太阳能电池

基于碘化甲脒 (FAI) 的钙钛矿吸收剂已被证明是高效且运行稳定的钙钛矿太阳能电池 (PSC) 的理想候选者。甲脒碘化铅 (FAPbI ₃ ) 的一个主要挑战是抑制从光活性黑色相到黄色非钙钛矿 δ 相的相变。已经为基于溶液的钙钛矿开发了几种稳定黑色相的方法，而到目前为止，真空沉积的 FAPbI ₃鲜有报道。该研究证明了 FAPbI ₃的制备通过共蒸发并讨论下层空穴传输层 (HTL) 对其相稳定性的影响。通过在蒸发过程中使用过量的 FAI 结合来自 HTL 的膦酸基团，黑色钙钛矿相在室温下稳定。在共蒸发过程中进一步添加 32-59% 甲基碘化铵 (MAI) 可产生良好的吸收性能和 20.4% 的高 PSC 效率。此外，优化的 MAI 与 FAI 比率实现了出色的稳定性，在恒定运行 1000 小时后保持 100% 的初始 PSC 性能。这种高度稳定的钙钛矿成分使第一个具有共蒸发钙钛矿吸收剂的单片全织构钙钛矿/硅串联太阳能电池成为可能。由于共形覆盖的金字塔纹理，

更新日期：2021-09-16

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