Poly(N-(5-(5-norbornene-2-carbonyl)oxy)pentyl)-N′-n-hexyl-naphthalene-1,8:4,5-bis(dicarboximide) has been synthesized by esterification of (N-(5-hydroxypentyl)-N′-n-hexyl-naphthalene-1,8:4,5-bis(dicarboximide)) with exo-5-norbornene-2-carboxylic acid, and has been polymerized using the first-generation Grubbs initiator. This side-chain polymer exhibits good transparency throughout the visible (absorption onset at ca. 400 nm), good solubility in common low- and medium-polarity organic solvents, good resistance to dimethylformamide, and appropriate electron affinity for use as an electron-extraction layer in lead-halide perovskite solar cells. The performance of this polymer in n-i-p perovskite solar cells was compared to that of several small-molecule naphthalene-1,8:4,5-bis(dicarboximide) derivatives and of SnO₂. Solar cells using the polymer exhibited open-circuit voltages of up to 1.02 V, short-circuit currents of over 21 mA cm⁻², and power conversion efficiencies (PCE) reaching 14% which stabilize at 13.8% upon 90 s of illumination. Meanwhile control SnO₂ devices exhibited a PCE of ca. 16%, and small-molecule devices gave PCE values of less than 10%. The devices employing the polymer exhibited improved long-term stability relative to the SnO₂ control devices under continuous illumination.

中文翻译：

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萘二酰亚胺侧链聚合物作为稳定钙钛矿太阳能电池的电子提取层

聚（ñ - （5-（5-降冰片烯-2-羰基）氧基）戊基）-N ' - ñ -己基-萘-1,8-：4,5-双（二甲酰亚胺）已经通过酯化合成（Ñ - （5-羟基戊基）-N ' - ñ -己基-萘-1,8-：4,5-双（二甲酰亚胺））与外-5-降冰片烯-2-羧酸，以及使用该第一代已被聚合Grubbs引发剂。这种侧链聚合物在整个可见光范围内都表现出良好的透明性（吸收起始点在大约2400 nm），在常见的低极性和中极性有机溶剂中具有良好的溶解性，对二甲基甲酰胺的良好耐受性以及在卤化钙钛矿型太阳能电池中用作电子提取层的适当的电子亲和力。将这种聚合物在nip钙钛矿太阳能电池中的性能与几种小分子萘-1,8：4,5-双（二甲酰亚胺）衍生物和SnO _{2的性能进行了比较}。使用该聚合物的太阳能电池表现出高达1.02 V的开路电压，超过21 mA cm ^-2的短路电流，以及达到14％的功率转换效率（PCE），在90 s的照射下稳定在13.8％。同时，控制SnO ₂器件的PCE约为。16％，小分子设备的PCE值小于10％。相对于连续照明下的SnO ₂控制装置，采用该聚合物的装置表现出改善的长期稳定性。