Fully Solution-Processed Small Molecule Semitransparent Solar Cells: Optimization of Transparent Cathode Architecture and Four Absorbing Layers

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• 作者：Jie Min ; Carina Bronnbauer ; Zhi-Guo Zhang ; Chaohua Cui ; Yuriy N. Luponosov ; Ibrahim Ata ; Peter Schweizer ; Thomas Przybilla ; Fei Guo ; Tayebeh Ameri ; Karen Forberich ; Erdmann Spiecker ; Peter Buerle ; Sergei A. Ponomarenko ; Yongfang Li and Christoph J. Brabec
• 刊名：Advanced Functional Materials
• 出版年：2016
• 出版时间：July 5, 2016
• 年：2016
• 卷：26
• 期：25
• 页码：4543-4550
• 全文大小：1602K
• ISSN：1616-3028

文摘

Semitransparent solar cells (SSCs) can open photovoltaic applications in many commercial areas, such as power-generating windows and building integrated photovoltaics. This study successfully demonstrates solution-processed small molecule SSCs with a conventional configuration for the presently tested material systems, namely BDTT-S-TR:PC₇₀BM, N(Ph-2T-DCN-Et)₃:PC₇₀BM, SMPV1:PC₇₀BM, and UU07:PC₆₀BM. The top transparent cathode coated through solution processes employs a highly transparent silver nanowire as electrode together with a combination interface bilayer of zinc oxide nanoparticles (ZnO) and a perylene diimide derivative (PDINO). This ZnO/PDINO bilayer not only serves as an effective cathode buffer layer but also acts as a protective film on top of the active layer. With this integrated contribution, this study achieves a power conversion efficiency (PCE) of 3.62% for fully solution-processed SSCs based on BDTT-S-TR system. Furthermore, the other three systems with various colors exhibited the PCEs close to 3% as expected from simulations, demonstrate the practicality and versatility of this printed semitransparent device architecture for small mole­cule systems. This work amplifies the potential of small molecule solar cells for window integration.