Revealing defective nanostructured surfaces and their impact on the intrinsic stability of hybrid perovskites,Energy & Environmental Science

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Revealing defective nanostructured surfaces and their impact on the intrinsic stability of hybrid perovskites
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2021-1-25 , DOI: 10.1039/d1ee00116g
Yuze Lin _{1,

2,

3,

4} , Ye Liu _{1,

2,

3,

4,

5} , Shangshang Chen _{1,

2,

3,

4} , Shen Wang _{1,

2,

3,

4} , Zhenyi Ni _{1,

2,

3,

4} , Charles H. Van Brackle _{1,

2,

3,

4} , Shuang Yang _{1,

2,

3,

4} , Jingjing Zhao _{1,

2,

3,

4} , Zhenhua Yu _{1,

2,

3,

4} , Xuezeng Dai _{1,

2,

3,

4} , Qi Wang _{1,

2,

3,

4} , Yehao Deng _{1,

2,

3,

4} , Jinsong Huang _{1,

2,

3,

4,

5}

Affiliation

The instability of metal halide perovskites (MHPs) remains to be one major obstacle for the commercialization of perovskite solar cells. Here we report the observation of nanocrystals and some amorphous phases at the surface of apparent single crystalline grains in polycrystalline films deposited by almost all known solution deposition methods, which accelerate the degradation of MHPs. By removing the defective surface layer through mechanical polishing, the stability of perovskite films is significantly enhanced. Encapsulated solar cells based on polished MHPs retain 93% of their initial efficiency after continuous illumination for 2180 hours at 1 sun intensity and with ultraviolet radiation at 65 °C. Removing the defective surface layers restores the mechanical hardness to be comparable to that of single crystals, which suppresses ion migration and permeation of detrimental species into perovskite grains. This study narrows down the stability gap between the MHP polycrystalline films and single crystal perovskites which represents the upper limit for the stability of MHPs.

中文翻译：

揭示有缺陷的纳米结构表面及其对杂化钙钛矿固有稳定性的影响

金属卤化物钙钛矿（MHP）的不稳定性仍然是钙钛矿太阳能电池商业化的主要障碍之一。在这里我们报告观察到通过几乎所有已知的溶液沉积方法沉积的多晶膜中的表观单晶表面上的纳米晶体和一些非晶相，这加速了MHP的降解。通过机械抛光除去有缺陷的表面层，钙钛矿薄膜的稳定性得到显着提高。经过抛光的MHP封装的太阳能电池在1个太阳强度和65°C的紫外线辐射下连续照明2180小时后，仍保持93％的初始效率。去除有缺陷的表面层可以使机械硬度恢复到与单晶相当的水平，抑制离子迁移和有害物质渗透到钙钛矿颗粒中。这项研究缩小了MHP多晶膜和单晶钙钛矿之间的稳定性差距，这代表了MHP稳定性的上限。

更新日期：2021-02-17

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