Intermediate phase-enhanced Ostwald ripening for the elimination of phase segregation in efficient inorganic CsPbIBr2 perovskite solar cells
Intermediate phase-enhanced Ostwald ripening for the elimination of phase segregation in efficient inorganic CsPbIBr2 perovskite solar cells
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中间相增强奥斯特瓦尔德熟化消除高效无机 CsPbIBr2 钙钛矿太阳能电池中的相偏析
DOI：
10.1007/s40843-021-1660-6
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发表时间：
2021-06
影响因子：
8.1
通讯作者：
Cheng Yi-Bing
中科院分区：
文献类型：
--
作者：
Li Wei;Zhu Benjia;Rothmann Mathias Uller;Liu Amelia;Chen Weijian;Choo Yen Yee;Pai Narendra;Mao Wenxin;Zhang Tian;Bao Qiaoliang;Wen Xiaoming;Bach Udo;Etheridge Joanne;Cheng Yi-Bing
混合卤化物钙钛矿具有调谐带隙的能力，在串联太阳能电池、建造集成光伏和波长可调发光器件方面显示出诱人的应用前景。然而，在混合钙钛矿和无机钙钛矿中，卤化物在光照下或在黑暗中通过电荷载流子注入进行分离会导致禁带不稳定和电流-密度-电压(J-V)滞后，这可能会显著阻碍其应用。在这里，我们证明了通过控制CsPbIBr2前驱体溶液中的化学成分，引入中间相促进的Ostwald熟化，可以有效地缓解混合卤化物无机CsPbIBr2太阳电池中的卤化物偏析和J-V滞后。过量的PbBr2或CsI被加入到最初摩尔量的PbBr2和CsI前体溶液中。随着PbBr2-的过量，我们观察到钙钛矿颗粒尺寸增大，晶界和钙钛矿/二氧化钛界面没有可检测到的卤化物相分离，少数载流子寿命增加，J-V滞后减小，太阳电池性能得到改善。然而，不同的CsI：PbBr2化学计量比对钙钛矿太阳能电池的性能有不同的影响。过量的铅相与前驱体溶液中的二甲基亚砜(DMSO)反应生成Pb2-DMSO络合物和准二维(2D)CsPb2(i，Br5)5，有利于Ostwald的成熟和缺陷的消光。最终，PbBr2-过量前驱体组成的CsPbIBr2太阳电池的功率转换效率(PCE)达到9.37%(稳定的PCE为8.48%)，最大外量子效率超过90%。
Mixed halide perovskites with the ability to tune bandgaps exhibit attractive applications in tandem solar cells, building integrated photovoltaic and wavelength-tunable light-emitting devices. However, halide demixing under illumination or in the dark with a charge-carrier injection in both hybrid and inorganic perovskites results in bandgap instability and current-density-voltage (J-V) hysteresis, which can significantly hamper their application. Here, we demonstrate that halide segregation and J-V hysteresis in mixed halide inorganic CsPbIBr2 solar cells can be effectively mitigated by introducing an intermediate phase-enhanced Ostwald ripening through the control of the chemical composition in the CsPbIBr2 precursor solution. Excess amounts of either PbBr2 or CsI are incorporated into originally even molar amounts of PbBr2 and CsI precursor solutions. With the PbBr2-excess, we observed an enlarged perovskite grain size, no detectable halide phase segregation at the grain boundaries nor the perovskite/TiO2 interface, an increased minority carrier lifetime, a reduced J-V hysteresis, and an improved solar-cell performance. However, different CsI:PbBr2 stoichiometric ratios were found to have different effects on the performance of the perovskite solar cell. The excessive lead phase is reactive with the dimethyl sulfoxide (DMSO) in the precursor solution to form the Pb(I, Br)2-DMSO complex and the quasi-two-dimensional (2D) CsPb2(I, Br)5, which are conducive to Ostwald maturation and defect extinction. Finally, the CsPbIBr2 solar cell with a PbBr2-excess precursor composition reaches a power conversion efficiency (PCE) of 9.37% (stabilized PCE of 8.48%) and a maximum external quantum efficiency of over 90%.
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影响因子：
29.4
作者：
Lijian Zuo;Xueliang Shi;W. Fu;A. Jen
通讯作者：
Lijian Zuo;Xueliang Shi;W. Fu;A. Jen
影响因子：
9.5
作者：
Chen, Weijian;Wen, Xiaoming;Conibeert, Gavin
通讯作者：
Conibeert, Gavin
DOI：
10.1021/acs.jpclett.5b02828
发表时间：
2016-02-04
期刊：
The journal of physical chemistry letters
影响因子：
--
作者：
Yuan H;Debroye E;Janssen K;Naiki H;Steuwe C;Lu G;Moris M;Orgiu E;Uji-I H;De Schryver F;Samorì P;Hofkens J;Roeffaers M
通讯作者：
Roeffaers M
影响因子：
5.7
作者：
Beal, Rachel E.;Slotcavage, Daniel J.;McGehee, Michael D.
通讯作者：
McGehee, Michael D.
影响因子：
11.9
作者：
Eperon, Giles E.;Paterno, Giuseppe M.;Snaith, Henry J.
通讯作者：
Snaith, Henry J.