Highly efficient and stable inverted planar solar cells from (FAI)x(MABr)1-xPbI2 perovskites
Highly efficient and stable inverted planar solar cells from (FAI)x(MABr)1-xPbI2 perovskites
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(FAI)x(MABr)1-xPbI2 钙钛矿高效稳定的倒置平面太阳能电池
DOI：
10.1016/j.nanoen.2017.03.001
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发表时间：
2017
期刊：
影响因子：
17.6
通讯作者：
Wei Huang
中科院分区：
文献类型：
--
作者：
Weibo Yan;Haixia Rao;Chen Wei;Zhiwei Liu;Zuqiang Bian;Hao Xin;Wei Huang
我们报道了一种高效稳定的倒置平面铅混合卤化物（Br，I）钙钛矿太阳能电池，其结构为ITO/poly（3-bromothiophene）/（FA）y（MA）1− yPbBrxI 3 −x/C60/BCP/Ag（FA：HC（NH 2）2+; MA：CH 3 NH3+）。我们发现（FA）y（MA）1− yPbBrxI 3 − x的组成的微小变化对材料性质和器件性能有很大的影响。适当的Br掺杂会扩大MAPbBrxI 3 −x的带隙，并延长受激载流子的寿命，从而导致更高的器件开路电压（VOC）。用“FA”代替“MA”扩展了（FA）y（MA）1− yPbBrxI 3 − x的吸收，从而补偿了由于Br掺杂导致的MAPbBrxI 3 − x中的JSC损失。具有FA 0.8MA 0.2PbBr 0.2I2.8复合物的优化钙钛矿薄膜显示出670 ns的寿命和对830 nm的光电响应，导致22.2 mA cm−2的增强JSC，0.80的高FF和18.1%的效率。此外，基于FA 0.8MA 0.2PbBr 0.2I2.8的倒置装置显示出长期稳定性，在没有封装的手套箱中4个月后仍保持80%的效率。研究结果表明，通过优化吸收体材料的组成，可以获得高效、稳定的倒置平面钙钛矿太阳能电池，为它们在柔性或叠层太阳能电池中的应用提供了参考。
We report highly efficient and stable inverted planar lead mixed-halide (Br, I) perovskite solar cells with a configuration of ITO/poly(3-bromothiophene)/(FA)y(MA)1−yPbBrxI3−x/C60/BCP/Ag (FA: HC(NH2)2+; MA: CH3NH3+). We found that small changes in the composition of (FA)y(MA)1−yPbBrxI3−xhave big impact on the material properties and device performance. Appropriate Br-doping enlarges MAPbBrxI3−x's bandgaps and prolongs the life of the excited charge carrier, which leads to higher device open-circuit voltage (VOC). Replacing “MA” with “FA” extends the absorption of (FA)y(MA)1−yPbBrxI3−xwhich compensates theJSCloss in MAPbBrxI3−xfrom Br-doping. The optimized perovskite film with a composite of FA0.8MA0.2PbBr0.2I2.8shows a lifetime of 670 ns and a photoelectric response to 830 nm, resulting in an enhancedJSCof 22.2 mA cm−2, a high FF of 0.80, and an efficiency of 18.1%. In addition, the inverted device based on FA0.8MA0.2PbBr0.2I2.8showed long-term stability with 80% efficiency remained after 4 months in a glovebox without encapsulation. Our results demonstrate highly efficient and stable inverted planar perovskite solar cells can be achieved by optimizing absorber material composition, which offer a reference for their applications in flexible or tandem solar cells.