本文選題：PbI_2·NMP + CH_3NH_3PbI_(3-x)Br_x��； 參考：《合肥工業(yè)大學》2017年碩士論文

【摘要】：鈣鈦礦太陽電池是近年來學術(shù)界研究的熱點之一,鈣鈦礦吸收層是鈣鈦礦太陽電池的主要組成部分之一,對其光伏性能具有重要的影響。本論文通過分批加入PbI2和NMP、重復PbI2溶解和NMP加入操作、保持PbI2過量以防止PbI2·NMP2生成的方法(即重復PbI2溶解-NMP加入循環(huán)法),成功配制了 1.9 mol·dm-3高濃度的PbI2·NMP復合物前驅(qū)體溶液,并用兩步溶液法轉(zhuǎn)化相應PbI2·NMP復合物薄膜制備高厚度、全覆蓋、大顆粒、Br摻雜的CH3NH3PbI3-xBrx薄膜,組裝了結(jié)構(gòu)為FTO/c-Ti02/CH3NH3PbI3-xBrx/spiro-OMeTAD/Au的平板鈣鈦礦太陽電池。系統(tǒng)研究了兩步溶液法轉(zhuǎn)化制備鈣鈦礦薄膜過程中,PbI2·NMP復合物前驅(qū)體溶液的濃度、轉(zhuǎn)化溫度與轉(zhuǎn)化時間、混合鹵甲銨異丙醇溶液中CH3NH3Br含量對所得CH3NH3PbI3-xBrx薄膜的化學組成、光學吸收、晶相、微結(jié)構(gòu)的影響,并比較了與平板鈣鈦礦太陽電池的關(guān)系。結(jié)果表明,采用重復PbI2溶解-NMP加入循環(huán)法可成功配制高濃度的PbI2·NMP復合物前驅(qū)體溶液,且隨著PbI2·NMP復合物前驅(qū)體溶液濃度從1.5 mol·dm-3增加到1.7 mol·dm-3、1.9 mol·dm-3時,PbI2·NMP復合物薄膜的厚度從347 nm增加到382 nm、508 nm,相應的 CH3NH3PbI3_xBrx 薄膜的厚度從 444 nm 增加到 538 nm、596 nm;基于1.9 mol·dm 3的PbI2·NMP復合物前驅(qū)體溶液所得CH3NH3PbI3-xBrx薄膜的厚度最厚,基于1.9 mol·dm-33的PbI2·NMP復合物前驅(qū)體溶液的平板鈣鈦礦太陽電池在空氣相對濕度為50～54%下獲得了 12.13%的最高光電轉(zhuǎn)換效率和11.90±0.49%的平均光電轉(zhuǎn)換效率:當轉(zhuǎn)化溫度從100 ℃升高至120 ℃、140 ℃時,轉(zhuǎn)化時間從40 min降低到20min、10min,CH3NH3PbI3-xBrx薄膜的結(jié)晶度逐漸增強,鈣鈦礦顆粒大小從～250 nm增大至～500 nm、～800 nm,基于轉(zhuǎn)化溫度和轉(zhuǎn)化時間為140 ℃ 10 min組裝的平板鈣鈦礦太陽電池在空氣相對濕度為50～54%下獲得了 13.56%的最高光電轉(zhuǎn)換效率和12.46±1.10%的平均光電轉(zhuǎn)換效率;CH3NH3PbI3-xBrx薄膜中Br的含量隨著混合鹵甲銨異丙醇溶液中Br含量的增加呈線性增長,且CH3NH3PbI3-xBrx薄膜中Br含量的增長慢于混合鹵甲銨異丙醇溶液中Br含量的增長,隨著CH3NH3Br含量的增加,CH3NH3PbI3-xBrx薄膜的吸收開端藍移,(110)晶面CH3NH3PbI3-xBrx衍射峰位置向2θ增大的方向發(fā)生位移,使用CH3NH3Br/CH3NH3I物質(zhì)的量之比為10/90的混合鹵甲銨異丙醇溶液可制備的高結(jié)晶度、顆粒邊界少的CH3NH3PbI3-xBrx薄膜,相應平板鈣鈦礦太陽電池獲得了 14.88%的最高光電轉(zhuǎn)換效率和14.21±0.67%的平均光電轉(zhuǎn)換效率。
[Abstract]:Perovskite solar cells are one of the hot topics in academic research in recent years. Perovskite absorption layer is one of the main components of perovskite solar cells, which has an important impact on the photovoltaic performance of perovskite solar cells. In this paper, by adding PbI2 and NMP in batches, repeated PbI2 dissolution and NMP addition operations, keeping PbI2 excess to prevent PbI2 NMP2 generation (i.e. repeated PbI2 dissolution-NMP addition cycle method), a 1.9 mol dm-3 high concentration PbI2 NMP complex precursor solution was prepared successfully. CH3NH3PbI3-xBrx thin films with high thickness, full coverage and large particles doped with Br were prepared by two-step solution conversion of corresponding PbI2 NMP composite films. The flat perovskite solar cells with FTO/c-Ti02/CH3NH3PbI3-xBrx/spiro-OMeTAD/Au structure were assembled. The concentration of PbI2 NMP complex precursor solution, conversion temperature and conversion time, the chemical composition and optical absorption of CH3NH3Br in mixed Halogenumethylammonium isopropanol solution during the two-step solution conversion of perovskite thin films were systematically studied. The effect of crystal phase and microstructure on the relationship with flat perovskite solar cells was compared. The results showed that high concentration of PbI2 NMP complex precursor solution could be successfully prepared by repeated PbI2 solution-NMP addition cycle method. When the concentration of PbI2 NMP precursor solution increased from 1.5 mol dm-3 to 1.7 mol dm-31.9 mol dm-3, the thickness of PbI2 NMP composite film increased from 347nm to 382nmNM, and the corresponding thickness of CH3NH3PbI3_xBrx film increased from 444nm to 538nmNm; PbI2 NMP based on 1.9 mol dm _ 3 increased the thickness of PBI _ 2 composite film from 347nm to 382nm. The thickness of CH3NH3PbI3-xBrx film obtained from the solution of complex precursor is the thickest. The flat perovskite solar cells based on 1.9 mol dm-33 PbI2 NMP complex precursor solution obtained the highest photovoltaic conversion efficiency of 12.13% and the average photoelectric conversion efficiency of 11.90 鹵0.49% at air relative humidity of 50 ~ 54%. When the conversion temperature was raised from 100 鈩，

本文編號：1931949