Expanding the Light Harvesting of CsPbI2Br to Near Infrared by Integrating with Organic Bulk Heterojunction for Efficient and Stable Solar Cells,ACS Applied Materials & Interfaces

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Expanding the Light Harvesting of CsPbI2Br to Near Infrared by Integrating with Organic Bulk Heterojunction for Efficient and Stable Solar Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-10-03 , DOI: 10.1021/acsami.9b14957
Qiang Guo _{1,

2} , Yiming Bai ₁ , Kun Lang ₁ , Zhong-Zhen Yu ₃ , Tasawar Hayat ₄ , Ahmed Alsaedi ₄ , Erjun Zhou ₂ , Zhan’ao Tan _{1,

3}

Affiliation

All-inorganic perovskite (CsPbX₃, X = Br or I) solar cells demonstrate superior stability, while the power conversion efficiency (PCE) lags behind the organic–inorganic hybrid counterparts mainly due to the limitation of narrow absorption bands. To broaden their absorption spectrum and improve their PCE, all-inorganic perovskite/organic integrated solar cells utilizing CsPbI₂Br as an ultraviolet–visible light absorber and PBDTTT-E-T:IEICO as a near-infrared light absorber are demonstrated in this work. The integrated solar cells exhibit a broadened photoresponse to over 900 nm, attributed to the integration of PBDTTT-E-T:IEICO. The additional absorption enhances the short-circuit current density from 14.78 to 15.98 mA/cm², resulting in greatly improved PCE of 14.03% for integrated solar cells, much higher than that of the control perovskite solar cells (12.53%) and organic solar cells (7.51%). An in-depth understanding of the charge-transfer dynamic process in the CsPbI₂Br/PBDTTT-E-T:IEICO film is comprehensively analyzed by photoinduced transient absorption spectroscopy. Furthermore, the air stability and thermal stability of the integrated solar cells are greatly enhanced. For unencapsulated integrated solar cells, the PCE still preserves 95% of its initial value after aging for 300 h in an ambient environment and retains about 90% of its original value even after aging at 85 °C for 180 h in nitrogen.

中文翻译：

通过与有机体异质结集成，将CsPbI ₂ Br的光收集范围扩大到近红外，从而获得高效稳定的太阳能电池

全无机钙钛矿（CsPbX ₃，X = Br或I）太阳能电池表现出优异的稳定性，而功率转换效率（PCE）则落后于有机-无机杂化钙钛矿，主要是由于窄吸收带的限制。为了扩大其吸收光谱并改善其PCE，在这项工作中展示了利用CsPbI ₂ Br作为紫外可见光吸收剂和PBDTTT-ET：IEICO作为近红外光吸收剂的全无机钙钛矿/有机集成太阳能电池。归因于PBDTTT-ET：IEICO的集成，集成的太阳能电池对900纳米以上的光表现出更宽的光响应。额外的吸收可将短路电流密度从14.78提高到15.98 mA / cm ²，因此集成太阳能电池的PCE大大提高了14.03％，远高于对照钙钛矿太阳能电池（12.53％）和有机太阳能电池（7.51％）的PCE。通过光诱导瞬态吸收光谱法全面分析了CsPbI ₂ Br / PBDTTT-ET：IEICO薄膜中电荷转移动力学过程。此外，大大提高了集成太阳能电池的空气稳定性和热稳定性。对于未封装的集成太阳能电池，PCE在周围环境中老化300小时后仍保持其初始值的95％，即使在85°C下在氮气中老化180h后仍保持其原始值的约90％。

更新日期：2019-10-03

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