有機－無機混合之具有ABX3晶體結構的鈣鈦礦材料，被認為太陽能電池下一個世代最有前景的材料之一。太陽能電池的吸光材料，在紅外光區與近紅光區具有較寬較強的吸收帶，因此將元件材料吸收範圍擴展到近紅外光區，將可提高鈣鈦礦太陽能電池的光伏性能。 本研究通過使用混合有機陽離子的鈣鈦礦材料，在固定鈣鈦礦結構為APbI3晶體結構下，透過改變A位的有機陽離子材料，使用混合有機陽離子Formamidinium(HN=CHNH3+，FA+)和Methylammonium(CH3NH3+，MA+)。可以透過調整混合陽離子間的比例，調整鈣鈦礦材料的能隙，進而提升鈣鈦礦材料在長波長區的吸收，同時藉由混合的有機陽離子鈣鈦礦材料，能夠提高鈣鈦礦薄膜的晶體結構穩定性，以及太陽能電池的環境穩定性。實驗上使用簡單、成本低廉以及高產出之超音波噴塗技術，製備平面異質結構的鈣鈦礦太陽能電池，經由優化最佳噴塗參數製備之元件，得到具有結構穩定和環境穩定性的鈣鈦礦太陽能元件，達到最高的光電轉換效率為15.57 %。 ;Halide perovskite materials with an ABX3 crystal structure, have recently become the subject of extreme interest for their use in photovoltaics and other optoelectronics. An important target for the further improvement of the performance of perovskite-based photovoltaics is to extend their optical-absorption onset further into the red to enhance solar-light harvesting. This goal can be reached by using a mixture of formamidinium (HN=CHNH3+, FA+) and methylammonium (CH3NH3+, MA+) cations in the A position of the APbI3 perovskite structure. By changing the ratio of MAI and FAI cations, it has been shown that the bandgap can be tuned, and that these mixed compositions have favorable properties in terms of structural stability in the black phase and performance. Herein we combine a simple, high throughput ultrasonic spray coating process to fabricate the planar hetero-junction perovskite solar cell, with a device architecture FTO/NiOx/FA0.25MA0.75PbI3/C60/BCP/Ag. The device shows the highest power conversion efficiency (PCE) of 15.57 %.
