Chemi-Structural Stabilization of Formamidinium Lead Iodide Perovskite by Using Embedded Quantum Dots,ACS Energy Letters

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Chemi-Structural Stabilization of Formamidinium Lead Iodide Perovskite by Using Embedded Quantum Dots
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-01-14 , DOI: 10.1021/acsenergylett.9b02450
Sofia Masi ₁ , Carlos Echeverría-Arrondo ₁ , K. M. Muhammed Salim ₁ , Thi Tuyen Ngo ₁ , P. F. Mendez _{1,

2} , Eduardo López-Fraguas _{1,

3} , David F. Macias-Pinilla _{1,

4} , Josep Planelles ₄ , Juan I. Climente ₄ , Iván Mora-Seró ₁

Affiliation

The approaches to stabilize the perovskite structure of formamidinium lead iodide (FAPI) commonly result in a blue shift of the band gap, which limits the maximum photoconversion efficiency. Here, we report the use of PbS colloidal quantum dots (QDs) as a stabilizing agent, preserving the original low band gap of 1.5 eV. The surface chemistry of PbS plays a pivotal role by developing strong bonds with the black phase but weak ones with the yellow phase. As a result, a stable perovskite FAPI black phase can be formed at temperatures as low as 85 °C in just 10 min, setting a record of concomitantly fast and low-temperature formation for FAPI, with important consequences for industrialization. FAPI thin films obtained through this procedure reach an open-circuit potential (V_oc) of 1.105 V, 91% of the maximum theoretical V_oc, and preserve the efficiency for more than 700 h. These findings reveal the potential of strategies exploiting the chemi-structural properties of external additives to relax the tolerance factor and optimize the optoelectronic performance of perovskite materials.

中文翻译：

嵌入量子点对甲酰胺碘化钙钛矿的化学结构稳定作用

稳定甲ami碘化铅（FAPI）钙钛矿结构的方法通常会导致带隙蓝移，从而限制了最大的光转换效率。在这里，我们报告使用PbS胶体量子点（QDs）作为稳定剂，保留了1.5 eV的原始低带隙。PbS的表面化学起着关键作用，与黑色相形成强键，而与黄色相形成弱键。结果，在低至85°C的温度下仅10分钟即可形成稳定的钙钛矿FAPI黑相，创下了FAPI伴随快速而低温形成的记录，对工业化具有重要意义。通过此过程获得的FAPI薄膜达到开路电位（V _oc）的1.105 V电压，为最大理论V _oc的91％，并保持700小时以上的效率。这些发现揭示了利用外部添加剂的化学结构性质来放松耐受因子并优化钙钛矿材料的光电性能的策略的潜力。

更新日期：2020-01-14

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