2023-07-17 米国国立再生可能エネルギー研究所(NREL)
◆このタイプの太陽電池は、前面での直接日光と背面での反射日光を捕捉することができ、単面太陽電池よりも優れた性能を持ちます。従来の双面ペロブスカイト太陽電池の研究では、効率が十分でないとされていましたが、NRELの研究者たちは前面照明時の効率を約23％、背面照明時の効率を前面の91～93％に達するよう設計しました。これにより、反射光の割合に応じて電池の効率が向上することが確認されました。
◆双面モジュールは初期製造コストこそ高いかもしれませんが、将来的には、増加した発電量によって長期的な投資として経済的に優位になると見込まれています。
＜関連情報＞
- https://www.nrel.gov/news/press/2023/news-release-bifacial-perovskite-solar-cells-point-to-higher-efficiency.html
- https://www.sciencedirect.com/science/article/pii/S2542435123002246?dgcid=author
高効率双面シングル接合ペロブスカイト太陽電池 Highly efficient bifacial single-junction perovskite solar cells
Qi Jiang, Zhaoning Song, Rosemary C. Bramante, Paul F. Ndione, Robert Tirawat, Joseph J. Berry, Yanfa Yan, Kai Zhu
Joule Published: June 29, 2023
DOI:https://doi.org/10.1016/j.joule.2023.06.001
Highlights
•High-efficiency p-i-n single-junction bifacial perovskite solar cells are reported
•Optical and electrical modeling improves the transparent rear electrode design
•Bifaciality of >91% and a front-illumination efficiency of >23% are achieved
•Bifacial output powers are 28.5 mW/cm2 (albedo = 0.3) and 30.1 mW/cm2 (albedo = 0.5)
Context & scale
The performance of bifacial single-junction perovskite solar cells is still far behind that of their state-of-the-art monofacial counterparts. It is challenging to achieve high bifaciality and high front-side illumination efficiency simultaneously. We used optical and electrical modeling to guide the optimization of the transparent conducting rear electrode and perovskite absorber layer using a p-i-n device architecture, achieving a high bifaciality of about 91%–93% and a high front-side illumination PCE of over 23%. Under concurrent bifacial measurement conditions, the equivalent, stabilized bifacial power output densities are 26.9, 28.5, and 30.1 mW/cm2 under albedos of 0.2, 0.3, and 0.5, respectively. Through energy yield and levelized cost of energy analysis, we showed that bifacial perovskite photovoltaics technology has the potential to outperform its monofacial counterparts.
Summary
Bifacial photovoltaics (PV) harvest solar irradiance from both their front and rear surfaces, boosting energy conversion efficiency to maximize their electrical power production. For single-junction perovskite solar cells (PSCs), the performance of bifacial configurations is still far behind that of their state-of-the-art monofacial counterparts. Here, we report on highly efficient, bifacial, single-junction PSCs based on the p-i-n (or inverted) architecture. We used optical and electrical modeling to design a transparent conducting rear electrode for bifacial PSCs to enable optimized efficiency under a variety of albedo illumination conditions. The bifaciality of the PSCs was about 91%–93%. Under concurrent bifacial measurement conditions, we obtained equivalent, stabilized bifacial power output densities of 26.9, 28.5, and 30.1 mW/cm2 under albedos of 0.2, 0.3, and 0.5, respectively. We further showed that bifacial perovskite PV technology has the potential to outperform its monofacial counterparts with higher energy yields and lower levelized cost of energy (LCOE).
