Synergic Interface and Optical Engineering for High‐Performance Semitransparent Polymer Solar Cells
Synergic Interface and Optical Engineering for High‐Performance Semitransparent Polymer Solar Cells
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DOI：
10.1002/aenm.201701121
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发表时间：
2017-07
影响因子：
27.8
通讯作者：
H. Shi;Ruoxi Xia;Chen Sun;Jingyang Xiao;Zhihong Wu;F. Huang;H. Yip;Yong Cao
中科院分区：
文献类型：
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作者：
H. Shi;Ruoxi Xia;Chen Sun;Jingyang Xiao;Zhihong Wu;F. Huang;H. Yip;Yong Cao
在这项研究中，系统地调整了PTB7‐Th:PC71BM体异质结（BHJ）薄膜和PF3N‐2TNDI电子传输层（ETL）的厚度，以实现当使用50 nm的超薄BHJ时，功率转换效率（PCE）超过9%的聚合物太阳能电池（PSCs）。光学模型表明，高PCE归因于ETL的光学间隔效应，这不仅使BHJ膜内的光场最大化，而且有助于在BHJ膜上形成更均匀分布的电荷生成剖面。实验进一步证明，在PTB7‐Th/PF3N‐2TNDI界面产生的额外光电流也有助于提高性能。利用这种高性能薄膜器件结构，进一步采用超薄透明银阴极代替厚银反射阴极来制造半透明PSCs (ST - PSCs)，产生一系列高性能ST - PSCs， pce超过6%，平均可见光透过率在20%至30%之间。这些ST - psc还具有卓越的透明色彩感知和渲染特性，这些特性是最先进的，符合不久的将来用作发电窗口的潜在性能标准。
In this study the thickness of the PTB7‐Th:PC71BM bulk heterojunction (BHJ) film and the PF3N‐2TNDI electron transport layer (ETL) is systematically tuned to achieve polymer solar cells (PSCs) with optimized power conversion efficiency (PCE) of over 9% when an ultrathin BHJ of 50 nm is used. Optical modeling suggests that the high PCE is attributed to the optical spacer effect from the ETL, which not only maximizes the optical field within the BHJ film but also facilitates the formation of a more homogeneously distributed charge generation profile across the BHJ film. Experimentally it is further proved that the extra photocurrent produced at the PTB7‐Th/PF3N‐2TNDI interface also contributes to the improved performance. Taking advantage of this high performance thin film device structure, one step further is taken to fabricate semitransparent PSCs (ST‐PSCs) by using an ultrathin transparent Ag cathode to replace the thick Ag mirror cathode, yielding a series of high performance ST‐PSCs with PCEs over 6% and average visible transmittance between 20% and 30%. These ST‐PSCs also possess remarkable transparency color perception and rendering properties, which are state‐of‐the‐art and fulfill the performance criteria for potential use as power‐generating windows in near future.