Open Circuit Potential Build-Up in Perovskite Solar Cells from Dark Conditions to 1 Sun

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• 作者：Laxman Gouda ; Ronen Gottesman ; Adam Ginsburg ; David A. Keller ; Eynav Haltzi ; Jiangang Hu ; Shay Tirosh ; Assaf Y. Anderson ; Arie Zaban Pablo P. Boix
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：November 19, 2015
• 年：2015
• 卷：6
• 期：22
• 页码：4640-4645
• 全文大小：395K
• ISSN：1948-7185

文摘

The high open-circuit potential (V_oc) achieved by perovskite solar cells (PSCs) is one of the keys to their success. The V_oc analysis is essential to understand their working mechanisms. A large number of CH₃NH₃PbI_3鈥?i>xCl_x PSCs were fabricated on single large-area substrates and their V_oc dependencies on illumination intensity, I₀, were measured showing three distinctive regions. Similar results obtained in Al₂O₃ based PSCs relate the effect to the compact TiO₂ rather than the mesoporous oxide. We propose that two working mechanisms control the V_oc in PSCs. The rise of V_oc at low I₀ is determined by the employed semiconductor n-type contact (TiO₂ or MgO coated TiO₂). In contrast, at I₀ close to AM1.5G, the employed oxide does not affect the achieved voltage. Thus, a change of regime from an oxide-dominated E_Fn (as in the dye sensitized solar cells) to an E_Fn, directly determined by the CH₃NH₃PbI_3鈥?i>xCl_x absorber is suggested.