Coordinated Optical Matching of a Texture Interface Made from Demixing Blended Polymers for High-Performance Inverted Perovskite Solar Cells.
Cun Yun Xu, Wei Hu, Gang Wang, Lianbin Niu, Ahmed Mourtada Elseman, Liping Liao, Yanqing Yao, Gaobo Xu, Lie Luo, Debei Liu, Guangdong Zhou, Ping Li, Qunliang Song
Author Information
Cun Yun Xu: Institute for Clean Energy and Advanced Materials, School of Materials and Energy , Southwest University, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy , Chongqing 400715 , P. R. China. ORCID
Wei Hu: Institute for Clean Energy and Advanced Materials, School of Materials and Energy , Southwest University, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy , Chongqing 400715 , P. R. China.
Gang Wang: Institute for Clean Energy and Advanced Materials, School of Materials and Energy , Southwest University, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy , Chongqing 400715 , P. R. China. ORCID
Lianbin Niu: College of Physics and Electronics Engineering , Chongqing Normal University , Chongqing 401331 , P. R. China.
Ahmed Mourtada Elseman: Institute for Clean Energy and Advanced Materials, School of Materials and Energy , Southwest University, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy , Chongqing 400715 , P. R. China. ORCID
Liping Liao: Institute for Clean Energy and Advanced Materials, School of Materials and Energy , Southwest University, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy , Chongqing 400715 , P. R. China.
Yanqing Yao: Institute for Clean Energy and Advanced Materials, School of Materials and Energy , Southwest University, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy , Chongqing 400715 , P. R. China.
Gaobo Xu: Institute for Clean Energy and Advanced Materials, School of Materials and Energy , Southwest University, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy , Chongqing 400715 , P. R. China.
Lie Luo: Institute for Clean Energy and Advanced Materials, School of Materials and Energy , Southwest University, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy , Chongqing 400715 , P. R. China.
Debei Liu: Institute for Clean Energy and Advanced Materials, School of Materials and Energy , Southwest University, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy , Chongqing 400715 , P. R. China.
Guangdong Zhou: Institute for Clean Energy and Advanced Materials, School of Materials and Energy , Southwest University, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy , Chongqing 400715 , P. R. China.
Ping Li: School of Physics and Electronic Science , Zunyi Normal College , Zunyi 563002 , P. R. China.
Qunliang Song: Institute for Clean Energy and Advanced Materials, School of Materials and Energy , Southwest University, Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy , Chongqing 400715 , P. R. China. ORCID
The continuing increase of the efficiency of perovskite solar cells has pushed the internal quantum efficiency approaching 100%, which means the light-to-carrier and then the following carrier transportation and extraction are no longer limiting factors in photoelectric conversion efficiency of perovskite solar cells. However, the optimal efficiency is still far lower than the Shockley-Queisser efficiency limit, especially for those inverted perovskite solar cells, indicating that a significant fraction of light does not transmit into the active perovskite layer to be absorbed there. Here, a planar inverted perovskite solar cell (ITO/PTAA/perovskite/PCBM/bathocuproine (BCP)/Ag) is chosen as an example, and we show that its external quantum efficiency (EQE) can be significantly improved by simply texturing the poly[bis (4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) layer. By washing the film prepared from a mixed polymer solution of PTAA and polystyrene (PS), a textured PTAA/perovskite interface is introduced on the light-input side of perovskite to inhibit internal optical reflection. The reduction of optical loss by this simple texture method increases the EQE and then the photocurrent of the ITO/PTAA/perovskite/PCBM/BCP/Ag device with the magnitude of about 10%. At the same time, this textured PTAA benefits the band edge absorption in this planar solar cell. The large increase of the short-circuit current together with the increase of fill factor pushes the efficiency of this inverted perovskite solar cell from 18.3% up to an efficiency over 20.8%. By using an antireflection coating on glass to let more light into the device, the efficiency is further improved to 21.6%, further demonstrating the importance of light management in perovskite solar cells.
