RbCs(MAFA)PbI3 perovskite solar cell with 22.81% efficiency using the precise ions cascade regulation
RbCs(MAFA)PbI3 perovskite solar cell with 22.81% efficiency using the precise ions cascade regulation
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DOI：
10.1016/j.apsusc.2020.147240
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发表时间：
2020-11-15
影响因子：
6.7
通讯作者：
Meng, Jing
中科院分区：
文献类型：
--
作者：
Gao, Bowen;Meng, Jing
通过控制钙钛矿前驱体溶液中Rb+和Cs+离子的掺杂比例，有效改善了钙钛矿薄膜的形貌，使薄膜棒状结构中的δ相（非钙钛矿相）和PbI 2相转变为α相（钙钛矿相），抑制了杂质相的形成。同时，Rb+和Cs+混合离子的加入可以嵌入（MA（0.5）FA（0.5））PbI 3薄膜的“离子级联”中，形成梯度电位。Rb+和Cs+离子能有效降低RbxCsx（MA（（）（1-）（2x）（）/2）FA（（1-）（2x）（）/2））PbI 3薄膜的非辐射复合和陷阱密度，并在钙钛矿薄膜中形成较大的晶粒和较小的表面粗糙度，有利于钙钛矿薄膜与电子传输层形成较好的接触，导致较大的开路电压，短路电流密度和填充因子。与未掺杂的（MA（0.5）FA（0.5））PbI 3钙钛矿太阳能电池的PCE（PCE = 17.15%，V-OC = 1.22V，J（SC）= 18.75mA/cm（2），FF = 75）相比，Rb0.2Cs0.2（MA（0.3）FA（0.）（3））掺杂浓度为20%的PbI 3钙钛矿太阳能电池提高到1.25V，短路电流密度提高到23.70mA/cm（2）且填充因子为77%，功率转换效率为22.81%，PCE提高近33%这是迄今为止报道的四组分RbxCsx（MA（（1-）（2x）（）/2）FA（（1-2x）/2））PbI 3钙钛矿太阳能电池的最高效率。
By controlling the doping ratio of Rb+ and Cs+ ions in the perovskite precursor solution, the morphology of the perovskite film is effectively improved, and the delta phase (non perovskite phase) and PbI2 phase in the rod-shaped structure of the film are transformed into a phase (perovskite phase), and the formation of impurity phase is inhibited. At the same time, the addition of mixed Rb+ and Cs+ ions can be embedded in the "ion cascade" of (MA(0.5)FA(0.5)) PbI3 films, and a gradient potential is formed. Rb+ and Cs+ ions can effectively reduce the non radiation recombination and trap density of RbxCsx(MA(()(1-)(2x)()/2) FA((1-)(2x)()/2)) PbI3 films, and form larger grains and smaller surface roughness in the perovskite films, which are conducive to the formation of better contact between the perovskite film and the electron transport layer, and result in larger open circuit voltage, short circuit current density and filling factor. Compared with the PCE of undoped (MA(0.5)FA(0.5)) PbI3 perovskite solar cells (PCE = 17.15%,V-OC = 1.22 V, J(SC) = 18.75 mA/cm(2), FF = 75), the open circuit voltage of Rb0.2Cs0.2(MA(0.3)FA(0.)(3))PbI3 perovskite solar cells with doping concentration of 20% is increased to 1.25 V, the short circuit current density is increased to 23.70 mA/cm(2) and the filling factor is 77%, the power conversion efficiency is 22.81%, and the increase of PCE is nearly 33%, which is the highest reported efficiency of a four component RbxCsx(MA((1-)(2x)()/2) FA((1-2x)/2)) PbI3 perovskite solar cell so far.