Progress of all-perovskite tandem solar cells: the role of narrow-bandgap absorbers
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ogress of all-perovskite tandem solar cells: the role of narrowbandgap absorbers 1
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Xinhui Luo , Tianhao Wu , Yanbo Wang , Xuesong Lin , Hongzhen Su , Qifeng Han & 1,2* Liyuan Han 1
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State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China; School of Materials Science and Engineering, Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450001, China Received July 7, 2020; accepted September 10, 2020; published online November 12, 2020
Perovskite solar cells (PSCs) have gained increasing attention due to their excellent photovoltaic performance, achieving certified power conversion efficiency (PCE) of 25.2%. To further enhance PCE and break the Shockley-Queisser limit of the single junction PSCs, great efforts have been made in tandem solar cells based on perovskite, including perovskite/Si, and perovskite/perovskite (all-perovskite). Among them, all-perovskite tandem solar cells exhibit unique advantages of both lowcost fabrication and high efficiency. They have advanced rapidly in these years, due to the realization of stable and efficient narrow-bandgap perovskites. In this work, we review the development of monolithic all-perovskite tandem solar cells and highlight the critical role of narrow-bandgap perovskites in recent progress of all-perovskite solar cells. We also propose our perspective of future directions on this subject. monolithic all-perovskite tandem solar cells, tin-lead perovskite, power conversion efficiency Citation:
Luo X, Wu T, Wang Y, Lin X, Su H, Han Q, Han L. Progress of all-perovskite tandem solar cells: the role of narrow-bandgap absorbers. Sci China Chem, 2020, 63, https://doi.org/10.1007/s11426-020-9870-4
1 Introduction Perovskite solar cells (PSCs) have been intensively investigated during the past decade [1]. To date, the singlejunction PSCs have achieved a power conversion efficiency (PCE) comparable to that of commercialized silicon technology. However, in single-junction solar cells, a semiconductor can only absorb incident photons with energy higher than its bandgap (Eg), and thereby the excess energy higher than the Eg is lost via thermalization process. Consequently, the thermalization loss and spectral loss restrict the efficiency of single-junction solar cells (Figure 1(a)). Hence, the maximum PCE is calculated to be 30%–33% with bandgap around 1.1 or 1.35 eV according to ShockleyQueisser (S-Q) theory [2,3]. To overcome this theoretical *Corresponding authors (email: [email protected]; [email protected])
limit, tandem devices which are constructed by semiconductors with different bandgaps are proposed [4]. For example, the double-junction tandem solar cells consist of a top subcell with wide-Eg and a bottom subcell with narrowEg, where the incident photons with higher energy are captured at the wide-Eg absorber, while the photons with lower energy are absorbed at the narrow-Eg absorber (Figure 1(b)). Therefore, tandem architectures enable more efficient use of solar energy with both
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