新型聚合物太陽能電池給體材料的制備與光電性能研究
[Abstract]:The Guang Min active layer of bulk heterogeneous polymer solar cell (PSCs) is composed of conjugated polymer donor material and fullerene derivative receptor material. Among them, the optical absorption properties, electronic properties, carrier migration properties and compatibility with fullerene derivative receptor materials of conjugated polymer materials are the core factors affecting the photoelectric efficiency of devices. As an important functional layer material of bulk Heterojunction polymer solar cells, the performance optimization of conjugated polymers is an important way to improve the efficiency of devices. Therefore, based on the optimization and design of polymer molecular structure, this paper takes the internal relationship between the structure and properties of polymer materials as the main content, and carries out the following work: 1. Based on benzodithiophene (BDT) donor unit and phenanthrene quinoxalin (PQX) receptor unit, a series of novel donor-recipient polymer materials PBDTPQX1, PBDTPQX2,PBDTPQX3 and PBDTPQX4. were prepared by molecular skeleton plane optimization and conjugated system regulation. Due to the broadening of the conjugated system in two-dimensional direction and the optimization of skeleton flatness, the energy conversion efficiency of polymer PBDTPQX4 is the best, and the short-circuit current is 11.6 mA/cm2,. The photoelectric efficiency is 4.32%. At the same time, the single hole device test shows that the hole carrier mobility of polymer material PBDTPQX4 is also much higher than that of PBDTPQX2 and PBDTPQX3.2.. Firstly, the dithiophene diketopyrrole (NAPDPP). Containing naphthalene group at the end of alkyl group was prepared. Based on the (IDT) donor unit of dicyclopentadiene benzodithiophene, four novel donor-recipient alternating polymers PIDTDPP1,PIDTDPP2, PIDTDPP3 and PIDTDPP4. were prepared by changing the ratio of DPP monomer to NAPDPP monomer containing Naphthalene side chain in polymerization. In order to adjust the compatibility of polymer donors with fullerene derivatives, the morphology of mixed films can be controlled from the molecular structure. The introduction of naphthalene group at the end of the side chain can significantly improve the morphology of the bulk Heterojunction mixed film and improve the performance of the device. However, with the increase of naphthalene composition, the 蟺-蟺 interaction between polymer chains tends to weaken. Based on the polymer PIDTDPP3, with 50% NAPDPP monomer ratio, the polymer PIDTDPP3, showed the best device performance, and the PCE reached 4.01%. 3. Based on the (BDT) donor unit of benzodithiophene unit, the polymer PBDTNQX. with Naphthalene quinoxaline (NQX) as receptor unit was successfully prepared by optimizing the molecular design of 2, 3-diphenylquinoxaline (DQX) receptor unit. Due to the widening of the conjugated system and the optimization of the skeleton planarity, the HOMO energy level of PBDTDTNQX with thiophene linked unit increases and has a wide spectral response. However, this kind of polymer donor materials show poor photovoltaic properties, and the main factors limiting their photoelectric properties may be the poor purity, poor solubility and low molecular weight of polymer materials.
【學(xué)位授予單位】:東南大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:O631;TM914.4
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