Tuning cesium–guanidinium in formamidinium tin triiodide perovskites with an ethylenediammonium additive for efficient and stable lead-free perovskite solar cells
Tuning cesium–guanidinium in formamidinium tin triiodide perovskites with an ethylenediammonium additive for efficient and stable lead-free perovskite solar cells
复制标题
使用乙二胺添加剂调节甲脒三碘化锡钙钛矿中的铯-胍，以实现高效稳定的无铅钙钛矿太阳能电池
DOI：
10.1039/d0ma00520g
复制
发表时间：
2020
影响因子：
5
通讯作者：
Yu, Qiuming
中科院分区：
文献类型：
--
作者：
Tosado, Gabriella A.;Zheng, Erjin;Yu, Qiuming
实现高效和稳定的锡基钙钛矿太阳能电池仍然具有挑战性。在这项工作中，我们将二碘化乙二胺（EDAI 2）添加剂掺入到铯-胍掺杂的三碘化甲脒锡钙钛矿中，其组成为（CsGA）xFA 1 − 2xSnI 3 + y%EDAI 2。这种新的钙钛矿利用胍阳离子的强氢键和小铯阳离子的晶格应变弛豫以及EDAI 2添加剂的中空和钝化效应。EDAI 2添加剂不仅产生无针孔的立方相钙钛矿薄膜，而且降低了钙钛矿薄膜中的浅陷阱态和深陷阱态。这些效应随着GA+和Cs+取代对的增加而显著。新的钙钛矿被部署在倒置的平面太阳能电池中。用（CsGA）0.15FA 0.70SnI3 + 0%EDAI 2器件实现了5.01%的最大功率转换效率（PCE），但是该器件在氮气填充的手套箱中储存30天后劣化。EDAI 2的加入提高了性能和稳定性。使用（CsGA）0.15FA0.70SnI3 + 1.0%EDAI 2器件实现了5.72%的最大PCE。（CsGA）0.15FA0.70SnI3 + 1.5%EDAI 2器件表现出5.69%的最大PCE，并且在充氮手套箱中储存4天后性能进一步增加至6.39%; 45天后保留70%的初始PCE。这项研究证明了调整阳离子尺寸和引入二价阳离子以将稳定因子整合到纯Sn钙钛矿中的好处，为高效稳定的无铅钙钛矿太阳能电池创造了新的途径。
Achieving efficient and stable tin-based perovskite solar cells remains challenging. In this work, we incorporate the ethylenediammonium diiodide (EDAI2) additive into a cesium–guanidinium doped formamidinium tin triiodide perovskite with the composition of (CsGA)xFA1−2xSnI3 + y% EDAI2. This new perovskite utilizes the strong hydrogen bonding of the guanidinium cation and the lattice strain relaxation of the small cesium cation as well as the hollowing and passivation effects of the EDAI2 additive. The EDAI2 additive not only yields pinhole-free cubic phase perovskite films but also decreases both shallow and deep trap states in the perovskite films. These effects are pronounced with the increase of substitution of the pair of GA+ and Cs+. The new perovskites are deployed in inverted planar solar cells. A maximum power conversion efficiency (PCE) of 5.01% is achieved with the (CsGA)0.15FA0.70SnI3 + 0% EDAI2 device but the device degrades after storage in a nitrogen-filled glove box for 30 days. Both performance and stability are improved with the addition of EDAI2. A maximum PCE of 5.72% is achieved with the (CsGA)0.15FA0.70SnI3 + 1.0% EDAI2 device. The (CsGA)0.15FA0.70SnI3 + 1.5% EDAI2 devices exhibit a maximum PCE of 5.69% and the performance is further increased to 6.39% after storage in a nitrogen-filled glove box for 4 days; 70% of the initial PCE is retained after 45 days. This study demonstrates the benefit of tuning cation sizes and introducing divalent cations to integrate stabilizing factors into pure Sn perovskites, creating new routes for efficient and stable lead-free perovskite solar cells.
影响因子：
--
作者：
Gabriella A. Tosado;Yi-Yu Lin;Erjin Zheng;Qiuming Yu
通讯作者：
Gabriella A. Tosado;Yi-Yu Lin;Erjin Zheng;Qiuming Yu
影响因子：
4.6
作者：
Stoumpos, Constantinos C.;Malliakas, Christos D.;Kanatzidis, Mercouri G.
通讯作者：
Kanatzidis, Mercouri G.
半导体基础知识和背景
DOI：
--
发表时间：
2019
期刊：
Materials and Energy
影响因子：
--
作者：
Gary W. Evans;Brenda L. Reis
通讯作者：
Brenda L. Reis