原位生长坚固的一维覆盖层，用于稳定高效的 CsPbI3 钙钛矿太阳能电池，无需空穴传输层,Advanced Energy Materials

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原位生长坚固的一维覆盖层，用于稳定高效的 CsPbI3 钙钛矿太阳能电池，无需空穴传输层
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2024-01-28 , DOI: 10.1002/aenm.202304038
Hailiang Wang ₁ , Yongfa Song ₁ , Zedong Lin _{2,

3} , Weiping Li ₁ , Huicong Liu ₁ , Xiaozhen Wei ₁ , Qixian Zhang ₁ , Chunyu Lv ₁ , Liqun Zhu ₁ , Kexiang Wang ₄ , Yisha Lan ₅ , Lan Wang ₆ , Changqing Lin ₇ , Penggang Yin ₄ , Tinglu Song ₅ , Yang Bai ₅ , Qi Chen ₅ , Shihe Yang _{2,

3} , Haining Chen ₁

Affiliation

CsPbI ₃钙钛矿由于其合适的带隙（E _g）和高化学稳定性而成为钙钛矿太阳能电池（PSC）中很有前途的光吸收剂，但钙钛矿相在环境大气中是亚稳态的并且容易形成缺陷。为了增强相稳定性并减少缺陷，在CsPbI ₃上形成低维（LD）钙钛矿已被证明是有效的。然而，大多数低电导率LD钙钛矿的能级与CsPbI ₃的能级不太兼容，这将损害电荷分离和器件性能。在此，报道了一种具有兼容能级和大E _g的新型一维钙钛矿（5-Azaspiro[4.4]nonan-5-ium 三碘化铅，ASNPbI ₃ ）作为覆盖层。 p型ASNPbI _3与n-CsPbI₃形成具有交错能带排列的pn异质结，显着增强了载流子分离。此外，通过在中间阶段预形成ASNPbI ₃ ，可以抑制钙钛矿膜中的缺陷。因此，基于无空穴传输体碳电极的CsPbI ₃ PSC（C-PSC）的PCE达到18.34％，这是无机C-PSC的最高报告值之一。此外，疏水性ASNPbI ₃覆盖层具有高热稳定性，大大增强了钙钛矿相稳定性。因此，CsPbI _{3 C-PSC 在 N}₂手套箱中 85°C 老化 400 小时后仍保持其初始 PCE 的 68% 。

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In Situ Growth of a Robust 1D Capping Layer for Stable and Efficient CsPbI3 Perovskite Solar Cells Without Hole Transporter

CsPbI₃ perovskite is a promising light absorber in perovskite solar cells (PSCs) due to its suitable bandgap (E_g) and high chemical stability, but the perovskite phase is metastable in ambient atmosphere and prone to defect formation. To enhance phase stability and reduce defects, forming a low dimensional (LD) perovskite on CsPbI₃ has proved effective. However, the energy levels for most of low-conductivity LD perovskites are not very compatible with those of CsPbI₃, which will impair charge separation and device performance. Herein, a new 1D perovskite (5-Azaspiro[4.4]nonan-5-ium lead triiodide, ASNPbI₃) with compatible energy levels and a large E_g is reported as a capping layer. The p-type ASNPbI₃ forms a p-n heterojunction with n-CsPbI₃ with a staggered band alignment, considerably enhancing the carrier separation. Besides, by pre-forming a ASNPbI₃ at an intermediate stage, defects are suppressed in perovskite film. Consequently, the CsPbI₃ PSCs based on carbon electrode without hole transporter (C-PSCs) achieves a PCE of 18.34%, which is among the highest-reported values for inorganic C-PSCs. Furthermore, the hydrophobic ASNPbI₃ capping layer has a high thermal stability that greatly enhances perovskite phase stability. Hence, the CsPbI₃ C-PSCs maintains 68% of its initial PCE after 400 h aging at 85°C in a N₂ glovebox.

更新日期：2024-01-28

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