两步沉积法制备Br或Cl掺杂的有机-无机杂化钙钛矿太阳电池（英文）

Organic-Inorganic Hybrid Perovskite Solar Cells Processed with Br or Cl Doping via a Two-Step Deposition

采用控制前驱体浓度的两步沉积法和插入PbI_2层的DMSO分子(PbI_2(DMSO)复合体)分别与MAX(MA=CH3NH3,X=I,Br)或MAX(X=I,Cl)进行的分子内交换法,实现了Br或Cl的掺杂并合成了厚度为300nm左右的混合卤化物钙钛矿MAPbI_(3-x)Br_x和MAPb I3-xClx膜。MAX前驱体溶液中含5%(摩尔分数,下同)MABr或15%MACl所生成的Br或Cl掺杂钙钛矿膜能提高钙钛矿太阳电池的光伏性能,进一步提高MABr或MACl的含量并不会明显改变掺杂量,但会形成小的白色颗粒或者针孔,这些将对电池的性能产生不利影响。前驱体溶液含5%MABr的MAPbI_(3-x)Br_x钙钛矿太阳电池所获得的能量转换效率(PCE)为13.2%,含15%MACl的MAPbI_(3-x)Cl_x钙钛矿太阳电池获得了最高13.5%的PCE。

Mixed halide perovskites of MAPbl3-xBrx and MAPbl3-xCl,x（MA = CH3NH3） with film thickness of about 300 nm were synthesized through the Br or CI doping, thanks to the two steps deposition of controlled concentration of the precursor solution and the intramolecular exchange of DMSO molecules intercalated in Pbl2 （Pbl2（DMSO） complex） with MAX （X = I, Br） or MAX （X = I, CI）, respectively. The doping of Br or CI in the perovskite film can improve the photovoltaic performance of PSCs with the precursor of MAX contains 5% （in mole fraction, same below） MABr or 15% MACI, respectively, while further increase in the content of MABr or MACI in the precursor did not lead to significant changes in doping amounts, but small white particles or pin-holes were formed in mixed perovskite materials, therefore resulted in adverse effects on the performance of solar cells. The MAPbl3 xBrx perovskite solar ceils with 5% MABr in precursor solution showed a power conversion efficiency （PCE） of 13.2%, and the MAPbl3-x ,Clx perovskite solar cells with 15% MACI in precursor solution showed the highest PCE of 13.5%.