Surface sulfidation constructing gradient heterojunctions for high-efficiency (approaching 18%) HTL-free carbon-based inorganic perovskite solar cells

IF 19.5 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Energy Pub Date : 2024-08-23 DOI:10.1002/cey2.586

Xiaonan Huo, Jinqing Lv, Kexiang Wang, Weiwei Sun, Weifeng Liu, Ran Yin, Yansheng Sun, Yukun Gao, Tingting You, Penggang Yin

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Abstract

Due to the advantages of cost-effectiveness and tunable band gap, hole transport layer (HTL)-free CsPbI_XBr_3−X carbon-based inorganic perovskite solar cells (C-IPSCs) are emerging candidates for both single junction and tandem solar cells. Because of the direct contact between the carbon electrode and the perovskite surface, energy barriers and defects at the interface limit the enhancement of power conversion efficiency (PCE). In this work, we first reported a preparation method of CsPbI_2.75Br_0.25 HTL-free C-IPSCs and developed an effective surface sulfidation regulation (SSR) strategy to promote hole extraction and inhibit non-radiative recombination of inorganic perovskite by 2-(thiocyanomethylthio)benzothiazole (TCMTB) surface modification. The introduced S²⁻ anions form strong binding with uncoordinated Pb ions, inhibit the perovskite degradation reaction, and effectively passivate the surface defects. In addition, PbS formed by the SSR strategy constructed a gradient heterojunction, which promoted the arrangement energy levels and enhanced hole extraction. An additional back-surface field is induced at the interface of perovskite by energy band bending, which increases the open-circuit voltage (V_OC). As a result, the SSR-based CsPbI_2.75Br_0.25 HTL-free C-IPSCs showed a PCE of 17.88% with a fill factor of 81.56% and V_OC of 1.19 V, which was among the highest reported values of CsPbI_2.75Br_0.25 HTL-free C-IPSCs.

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通过表面硫化构建梯度异质结，实现高效率（接近 18%）无 HTL 碳基无机过氧化物太阳能电池

无空穴传输层（HTL）的 CsPbIXBr3-X 碳基无机包晶体太阳能电池（C-IPSC）具有成本效益高和带隙可调的优点，正在成为单结和串联太阳能电池的新候选材料。由于碳电极与包晶石表面直接接触，界面上的能障和缺陷限制了功率转换效率（PCE）的提高。在这项工作中，我们首次报道了 CsPbI2.75Br0.25 无 HTL C-IPSC 的制备方法，并开发了一种有效的表面硫化调节（SSR）策略，通过 2-（硫氰酸甲硫基）苯并噻唑（TCMTB）表面改性来促进空穴萃取并抑制无机包晶的非辐射重组。引入的 S2- 阴离子与未配位的铅离子形成强结合，抑制了包晶的降解反应，并有效地钝化了表面缺陷。此外，通过 SSR 策略形成的 PbS 构建了梯度异质结，促进了排列能级，增强了空穴萃取。能带弯曲在包晶界面上诱发了额外的背表面场，从而提高了开路电压（VOC）。因此，基于 SSR 的 CsPbI2.75Br0.25 无 HTL C-IPSC 的 PCE 为 17.88%，填充因子为 81.56%，VOC 为 1.19 V，是已报道的 CsPbI2.75Br0.25 无 HTL C-IPSC 的最高值之一。

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来源期刊

Carbon Energy Multiple-

CiteScore

25.70

自引率

10.70%

发文量

116

审稿时长

4 weeks

期刊介绍： Carbon Energy is an international journal that focuses on cutting-edge energy technology involving carbon utilization and carbon emission control. It provides a platform for researchers to communicate their findings and critical opinions and aims to bring together the communities of advanced material and energy. The journal covers a broad range of energy technologies, including energy storage, photocatalysis, electrocatalysis, photoelectrocatalysis, and thermocatalysis. It covers all forms of energy, from conventional electric and thermal energy to those that catalyze chemical and biological transformations. Additionally, Carbon Energy promotes new technologies for controlling carbon emissions and the green production of carbon materials. The journal welcomes innovative interdisciplinary research with wide impact. It is indexed in various databases, including Advanced Technologies & Aerospace Collection/Database, Biological Science Collection/Database, CAS, DOAJ, Environmental Science Collection/Database, Web of Science and Technology Collection.