当前位置:科学网首页 > 小柯机器人 >详情
SnO2电极上具有原子共格界面中间层的钙钛矿型太阳电池
作者:小柯机器人 发布时间:2021/10/23 19:58:20

蔚山国立科学技术研究院Sang Il Seok研究小组近日开发出在SnO2电极上具有原子共格界面中间层的钙钛矿太阳能电池。2021年10月20日,国际知名学术期刊《自然》发表了这一成果。

在该研究中,研究人员通过将与Cl成键的SnO2与含Cl的钙钛矿前驱体耦合,在SnO2电子传输层和卤化物钙钛矿吸光层之间形成中间层。该层具有原子级共格界面,增强了钙钛矿层的电荷提取和传输,减少了界面间缺陷。这种共格界面中间层的存在使研究人员得以制造出在标准照明下能量转换效率为25.8%(认证为25.5%)的钙钛矿太阳能电池。此外,未封装的器件即使在500小时的光照后仍然保持了大约90%的初始效率。他们的发现为设计金属卤化物钙钛矿和电子传输层之间的缺陷最小化界面提供了指导。

研究人员表示,在钙钛矿太阳能电池中,钙钛矿与电荷传输层之间的界面上含有高浓度的缺陷(约为钙钛矿层内部缺陷的100倍),尤其是深层缺陷,这大大降低了器件的能量转换效率。近年来减少这些界面缺陷的努力主要集中在表面钝化上。然而,钝化与电子传递层交界的钙钛矿界面是困难的,因为电子传递层上的表面处理剂在覆盖钙钛矿薄膜时可能会溶解。如果换一种方式,在电子输运层和钙钛矿层之间形成共格界面,则界面缺陷可能不是问题。

附:英文原文

Title: Perovskite solar cells with atomically coherent interlayers on SnO2 electrodes

Author: Min, Hanul, Lee, Do Yoon, Kim, Junu, Kim, Gwisu, Lee, Kyoung Su, Kim, Jongbeom, Paik, Min Jae, Kim, Young Ki, Kim, Kwang S., Kim, Min Gyu, Shin, Tae Joo, Il Seok, Sang

Issue&Volume: 2021-10-20

Abstract: In perovskite solar cells, the interfaces between the perovskite and charge-transporting layers contain high concentrations of defects (about 100 times that within the perovskite layer), specifically, deep-level defects, which substantially reduce the power conversion efficiency of the devices1,2,3. Recent efforts to reduce these interfacial defects have focused mainly on surface passivation4,5,6. However, passivating the perovskite surface that interfaces with the electron-transporting layer is difficult, because the surface-treatment agents on the electron-transporting layer may dissolve while coating the perovskite thin film. Alternatively, interfacial defects may not be a concern if a coherent interface could be formed between the electron-transporting and perovskite layers. Here we report the formation of an interlayer between a SnO2 electron-transporting layer and a halide perovskite light-absorbing layer, achieved by coupling Cl-bonded SnO2 with a Cl-containing perovskite precursor. This interlayer has atomically coherent features, which enhance charge extraction and transport from the perovskite layer, and fewer interfacial defects. The existence of such a coherent interlayer allowed us to fabricate perovskite solar cells with a power conversion efficiency of 25.8 per cent (certified 25.5 per cent)under standard illumination. Furthermore, unencapsulated devices maintained about 90 per cent of their initial efficiency even after continuous light exposure for 500 hours. Our findings provide guidelines for designing defect-minimizing interfaces between metal halide perovskites and electron-transporting layers.

DOI: 10.1038/s41586-021-03964-8

Source: https://www.nature.com/articles/s41586-021-03964-8

期刊信息

Nature:《自然》,创刊于1869年。隶属于施普林格·自然出版集团,最新IF:42.778
官方网址:http://www.nature.com/