In perovskite detectors that utilize SnO₂ as an electron transport layer (ETL), the preparation of SnO₂ films using the solution method results in a significant number of defects. Additionally, the presence of nano-aggregates in the aqueous solution of untreated SnO₂ colloids leads to surface unevenness in SnO₂ films prepared using the spin-coating method, which can affect the growth and crystallization of perovskite. Defects and surface unevenness in SnO₂ films affect the performance of perovskite detectors. To further optimize the performance of perovskite detectors, SnO₂ incorporating poly (ethylene glycol) bis (carboxymethyl) ether (PBE) was developed, employing the polymer as a modifier. The results of the study showed that the incorporation of PBE had two effects: 1) the ether oxygen within the PBE forms a coordination bond with SnO₂, thereby reducing oxygen vacancies, and 2) reducing nano-aggregation of SnO₂ colloidal aqueous solutions, obtaining more uniform SnO₂ films, and promoting the growth and crystallization of perovskite. Ultimately, the performance of the optimized device was improved. The external quantum efficiency (EQE) improved from 84.82 % to 89.29 %, the dark current density decreased from 3.27 × 10⁹ A cm² to 1.03 × 10¹⁰ A cm², the linear dynamic range (LDR) increased from 88.5 to 118.3 dB, and the stability was enhanced. The device maintained 64.9 % of its original efficiency after being stored for 23 days at 25 °C and 20–30 % humidity.

中文翻译：

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利用聚（乙二醇）双（羧甲基）醚和 SnO2 之间的配位来制备高性能钙钛矿光电探测器


在使用 SnO2 作为电子传输层 (ETL) 的钙钛矿探测器中，使用溶液法制备 SnO2 薄膜会导致大量缺陷。此外，未经处理的SnO2胶体水溶液中纳米聚集体的存在会导致旋涂法制备的SnO2薄膜表面不均匀，从而影响钙钛矿的生长和结晶。 SnO2 薄膜中的缺陷和表面不均匀会影响钙钛矿探测器的性能。为了进一步优化钙钛矿探测器的性能，开发了掺有聚（乙二醇）双（羧甲基）醚（PBE）的 SnO2，并使用聚合物作为改性剂。研究结果表明，PBE的掺入有两个作用：1）PBE内的醚氧与SnO2形成配位键，从而减少氧空位；2）减少SnO2胶体水溶液的纳米聚集，获得更多均匀的SnO2薄膜，促进钙钛矿的生长和结晶。最终，优化后的器件性能得到了提高。外量子效率（EQE）从84.82%提高到89.29%，暗电流密度从3.27×10⁹A cm²下降到1.03×10^10 A cm²，线性动态范围（LDR）从88.5dB增加到118.3dB，稳定性得到了增强。该器件在 25°C 和 20-30% 湿度下存放 23 天后，仍保持了 64.9% 的原始效率。