Ferroelectric polymers can effectively improve the photovoltaic performance of solar cells, inducing an electric field to promote the dissociation of electron-hole pairs, with the thus generated charges collected from open pores. Since such performance enhancement requires materials with a unique porous crystalline structure, we herein present a novel route to highly crystalline and porous poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) thin films utilizing a modified breath figure method based on spin coating. The key feature of the above method is the addition of small amounts of water to the acetone/P(VDF-TrFE) solution to produce porous ferroelectric thin films which have significantly higher crystallinity values than nanostructures or films prepared by other methods. Furthermore, n-Si / poly(3,4-ethylene dioxy thiophene):poly(styrene sulfonate) hybrid solar cells with porous P(VDF-TrFE) interlayers are demonstrated to exhibit spontaneous polarization sufficient for increasing their open circuit voltages and fill factors. Finite-difference time-domain simulation reveals that the electric field due to the above spontaneous polarization increases the built-in electric field of the Schottky junction between n-Si and poly(3,4-ethylene dioxy thiophene):poly(styrenesulfonate) and reduces the reverse leakage current of the Schottky diode. Thus, the organic ferroelectric thin films with controlled porosity proposed in this study are well suited for a broad range of optoelectronic applications.

铁电聚合物可以有效地改善太阳能电池的光伏性能，诱导电场以促进电子-空穴对的解离，从而从开孔中收集由此产生的电荷。由于这种性能的提高要求材料具有独特的多孔晶体结构，因此我们在本文中提出了一种基于改进的呼吸指数法的高结晶性和多孔性聚偏二氟乙烯-三氟乙烯共聚物（P（VDF-TrFE））薄膜的新途径。在旋涂上。上述方法的关键特征是向丙酮/ P（VD​​F-TrFE）溶液中添加少量水，以生产多孔铁电薄膜，该铁电薄膜的结晶度明显高于通过其他方法制备的纳米结构或薄膜。此外，具有多孔P（VDF-TrFE）中间层的n -Si /聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）杂化太阳能电池被证明具有自发极化作用，足以增加其开路电压和填充因子。时域有限差分仿真表明，上述自发极化引起的电场增加了n -Si与聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）和降低了肖特基二极管的反向泄漏电流。因此，这项研究中提出的具有可控孔隙率的有机铁电薄膜非常适合广泛的光电应用。