Unprecedented Long-Term Thermal Stability of 1D/2A Terpolymer-Based Polymer Solar Cells Processed with Nonhalogenated Solvent,Solar RRL

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Unprecedented Long-Term Thermal Stability of 1D/2A Terpolymer-Based Polymer Solar Cells Processed with Nonhalogenated Solvent
Solar RRL ( IF 6.0 ) Pub Date : 2021-09-09 , DOI: 10.1002/solr.202100513
Hyeonwoo Jung ₁ , Gyeonghwa Yu ₁ , Jongyoun Kim ₁ , Hyejeong Bae ₁ , Minkyoung Kim ₁ , Kwangmin Kim ₂ , BongSoo Kim ₂ , Youngu Lee ₁

Affiliation

Donor–acceptor (D–A) copolymer-based polymer solar cells (PSCs) processed with nonhalogenated solvents exhibit relatively low power conversion efficiencies (PCE) due to undesirable morphological properties, including high aggregation and unfavorable orientation. Moreover, they show very poor long-term stability owing to excessive molecular aggregation and unfavorable phase separation. Thus, novel p-type polymers are required for high-efficiency and long-lived PSCs that can be processed in ecofriendly nonhalogenated solvents. Herein, a novel series of 1D/2A terpolymers (PBTPBD) composed of 4,8-bis(5-(2-ethylhexyl)-4-fluorothiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene (BDT-F), 1,3-bis(thiophen-2-yl)-5,7-bis(2-ethylhexyl)benzo-[1,2-c:4,5-c′]dithiophene-4,8-dione (BDD), and 1,3-bis-(4-hexylthiophen-2-yl)-5-octyl-4H-thieno[3,4-c]pyrrole-4,6(5H)-dione (HT-TPD) is synthesized and characterized for high-efficiency and long-lived PSCs. A PBTPBD-50:IT-4F blended film exhibits a favorable face-on orientation and superior hole and electron mobility. Therefore, the corresponding PBTPBD-50:IT-4F PSC, processed with a nonhalogenated solvent, exhibits a high PCE of 13.64%, which is 13% higher than that of the related nonhalogenated solvent-processed PSCs. Furthermore, the PBTPBD-50:IT-4F PSC maintains 82% of the initial PCE even after 204 days at 85 °C, which is the highest thermal stability achieved among PSCs processed with nonhalogenated solvents. The high-efficiency and superior long-term thermal stability of the PBTPBD-50:IT-4F PSC are attributed to the excellent miscibility of PBTPBD-50 and IT-4F and the suppression of the morphological changes in the photoactive layer.

中文翻译：

使用非卤化溶剂处理的基于 1D/2A 三元共聚物的聚合物太阳能电池具有前所未有的长期热稳定性

用非卤化溶剂加工的基于供体 - 受体 (D-A) 共聚物的聚合物太阳能电池 (PSC) 表现出相对较低的功率转换效率 (PCE)，这是由于不理想的形态特性，包括高度聚集和不利的取向。此外，由于过度的分子聚集和不利的相分离，它们的长期稳定性非常差。因此，可以在环保的非卤化溶剂中加工的高效、长寿命的 PSC 需要新型 p 型聚合物。在此，由 4,8-双(5-(2-乙基己基)-4-氟噻吩-2-基)苯并[1,2- b :4,5- b ']二噻吩 (BDT-F), 1,3-双(噻吩-2-基)-5,7-双(2-乙基己基)苯并-[1,2- c :4,5- c']dithiophene-4,8-dione (BDD), and 1,3-bis-(4-hexylthiophen-2-yl)-5-octyl-4 H - thieno[3,4- c ]pyrrole-4,6 (5小时)-二酮 (HT-TPD) 被合成并表征为高效和长寿命的 PSC。PBTPBD-50:IT-4F 混合薄膜具有良好的正面取向和优异的空穴和电子迁移率。因此，相应的 PBTPBD-50:IT-4F PSC，用非卤化溶剂处理，表现出 13.64% 的高 PCE，比相关非卤化溶剂处理的 PSC 高 13%。此外，即使在 85°C 下 204 天后，PBTPBD-50:IT-4F PSC 仍能保持初始 PCE 的 82%，这是使用非卤化溶剂加工的 PSC 中达到的最高热稳定性。PBTPBD-50:IT-4F PSC 的高效和卓越的长期热稳定性归因于 PBTPBD-50 和 IT-4F 的优异混溶性以及对光敏层形态变化的抑制。

更新日期：2021-11-04

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