Solution-Processed Titanium Chelate Used as Both Electrode Modification Layer and Intermediate Layer for Efficient Inverted Tandem Polymer Solar Cells  

作　　者：Zhenzhen Shi Hao Liu Lixing Xia Yiming Bai Fuzhi Wang Bing Zhang Tasawar Hayat Ahmed Alsaedi CandZhan'ao Tan 

机构地区：[1]State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China [2]Department of Mathematics, Quiad-l-Azam University, Islamabad, Pakistan [3]NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia

出　　处：《Chinese Journal of Chemistry》2018年第3期194-198,共5页中国化学（英文版）

摘　　要：ABSTRACT Organic polymer solar cells （PSCs） have attracted increasing attention due to light weight, low cost, flexibility and roll-to-roll manufacturing. However, the limited light harvest range of the photoactive layer greatly restrains the power conversion efficiency （PCE） enhancement. In order to expand the light absorption range and further enhance the PCE of the PSCs, tandem structures have been designed and demonstrated. In tandem solar cell, the intermediate layer （IML） plays a critical role in physically and electrically connection of the two subcells. Herein, we apply titanium （diisopropoxide） bis（2,4-pentanedionate） （TIPD） as both electrode modification layer and intermediate layer to investigate the feasibility in inverted tandem polymer solar cells. The same photoactive layers of PTB7-Th：PC71BM are adopted in both front and rear subcells to simplify the evaluation of effectiveness of TIPD layer in tandem structures. By modulating the treatment condition of IML and the thickness of photoactive layer, efficient inverted tandem PSCs have been achieved with minimized voltage loss and excellent charge transportation, giving a best Voc of 1.54 V, which is almost two times that of the single bulk heterojunction （BHJ）-PSC （0.78 V） and an enhanced PCE up to 8.11%.ABSTRACT Organic polymer solar cells （PSCs） have attracted increasing attention due to light weight, low cost, flexibility and roll-to-roll manufacturing. However, the limited light harvest range of the photoactive layer greatly restrains the power conversion efficiency （PCE） enhancement. In order to expand the light absorption range and further enhance the PCE of the PSCs, tandem structures have been designed and demonstrated. In tandem solar cell, the intermediate layer （IML） plays a critical role in physically and electrically connection of the two subcells. Herein, we apply titanium （diisopropoxide） bis（2,4-pentanedionate） （TIPD） as both electrode modification layer and intermediate layer to investigate the feasibility in inverted tandem polymer solar cells. The same photoactive layers of PTB7-Th：PC71BM are adopted in both front and rear subcells to simplify the evaluation of effectiveness of TIPD layer in tandem structures. By modulating the treatment condition of IML and the thickness of photoactive layer, efficient inverted tandem PSCs have been achieved with minimized voltage loss and excellent charge transportation, giving a best Voc of 1.54 V, which is almost two times that of the single bulk heterojunction （BHJ）-PSC （0.78 V） and an enhanced PCE up to 8.11%.

关 键 词：polymer solar cells titanium （diisopropoxide） bis（2 4-pentanedionate） intermediate layer tandem structure 

分 类 号：U484[交通运输工程—载运工具运用工程] TM914.4[交通运输工程—道路与铁道工程]