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首页> 外文期刊>Organic Electronics >Surface polarization and recombination in organic-inorganic hybrid perovskite solar cells based on photo- and electrically induced negative capacitance studies
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Surface polarization and recombination in organic-inorganic hybrid perovskite solar cells based on photo- and electrically induced negative capacitance studies

机译：基于光和电感应负电容研究的有机-无机杂化钙钛矿太阳能电池的表面极化和复合

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Recent studies have shown that organic-inorganic hybrid perovskites (OIHPs) exhibit unprecedented optoelectronic properties for photovoltaic applications. Complete realizations of photo- and electrically induced surface polarization and recombination are critically important for extensively upgrading solar cell performance. We have explored such effects in a planar solar cell comprising ITO(glass)/PEDOT:PSS/CH3NH3PbI3-xClx/PC60BM/PEI/Ag with a maximum power conversion efficiency (PCE) of 15.4%. A remarkable frequency-dependence of surface polarization was observed for the operating device under illumination (i.e. short-circuit current J(SC) condition) and at steady state (i.e. open-circuit voltage V-OC condition). A sign reversal of the capacitance (i.e. negative capacitance) associated with the surface polarization and recombination was detected at some specific steady states. Based on capacitance-voltage (C-V) spectroscopic measurements and theoretical fittings, they can be understood that, (i) a naturally formed surface depletion region due to energy mismatch can be fully suppressed at a very low fluence and moderate forward bias voltage; (ii) a surface capacitance (C-s) appears at lower ac-modulation frequencies only; (iii) remarkable trap-assist and band to band surface recombination may play the dominant roles for generating the negative capacitive effect in the CH3NH3PbI3-xClx based photovoltaic system.
机译：最近的研究表明，有机-无机杂化钙钛矿（OIHP）对光伏应用显示出前所未有的光电性能。光和电诱导的表面极化和复合的完整实现对于广泛提高太阳能电池性能至关重要。我们已经在包含ITO（玻璃）/ PEDOT：PSS / CH3NH3PbI3-xClx / PC60BM / PEI / Ag的平面太阳能电池中探索了这种效应，其最大功率转换效率（PCE）为15.4％。在照明（即短路电流J（SC）条件）和稳定状态（即开路电压V-OC条件）下，观察到操作设备的表面极化具有明显的频率依赖性。在某些特定的稳定状态下检测到与表面极化和复合相关的电容的符号反转（即负电容）。基于电容电压（C-V）光谱测量和理论拟合，可以理解：（i）在非常低的注量和适度的正向偏置电压下，可以完全抑制由于能量失配导致的自然形成的表面耗尽区； （ii）仅在较低的交流调制频率下出现表面电容（C-s）； （iii）在基于CH3NH3PbI3-xClx的光伏系统中，显着的陷阱辅助和能带间表面重组可能在产生负电容效应中起主要作用。

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