Integrated Perovskite/Bulk-Heterojunction toward Efficient Solar Cells

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• 作者：Yongsheng Liu ; Ziruo Hong ; Qi Chen ; Weihsuan Chang ; Huanping Zhou ; Tze-Bin Song ; Eric Young ; Yang (Michael) Yang ; Jingbi You ; Gang Li ; Yang Yang
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：January 14, 2015
• 年：2015
• 卷：15
• 期：1
• 页码：662-668
• 全文大小：463K
• ISSN：1530-6992

文摘

We successfully demonstrated an integrated perovskite/bulk-heterojunction (BHJ) photovoltaic device for efficient light harvesting and energy conversion. Our device efficiently integrated two photovoltaic layers, namely a perovskite film and organic BHJ film, into the device. The device structure is ITO/TiO₂/perovskite/BHJ/MoO₃/Ag. A wide bandgap small molecule DOR3T-TBDT was used as donor in the BHJ film, and a power conversion efficiency (PCE) of 14.3% was achieved in the integrated device with a high short circuit current density (J_SC) of 21.2 mA cm^鈥?. The higher J_SC as compared to that of the traditional perovskite/HTL (hole transporting layer) device (19.3 mA cm^鈥?) indicates that the BHJ film absorbs light and contributes to the current density of the device. Our result further suggests that the HTL in traditional perovskite solar cell, even with good light absorption capability, cannot contribute to the overall device photocurrent, unless this HTL becomes a BHJ layer (by adding electron transporting material like PC₇₁BM).